Company lists · Data refreshed September 2026
Top 25 Professional services outsourcing firms based in the United Kingdom
RevenueBase identified 517 company matches for professional services outsourcing firms associated with the United Kingdom as of September 2026 and tracks 5,840 professional contacts across them, including 1,808 with verified work emails. London is the largest hub.
This list covers company matches for professional services outsourcing firms associated with the United Kingdom, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 29, 2026.
Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.
The 25 largest professional services outsourcing firms based in the United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 870 contacts → | ||||
Exact match “At Oliver James, we deliver flexible hiring solutions tailored to your business needs across financial services, professional services, commerce & industry.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
| 2 | 477 contacts → | ||||
Exact match “Outbooks is a leading provider of outsourcing services to accounting and bookkeeping firms.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
| 3 | 333 contacts → | ||||
Exact match “Ubique Systems is a fast growing multifaceted organization which offers a comprehensive array of outsourcing and consulting services for its customers, including recruitment…” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
| 4 | 322 contacts → | ||||
Exact match “At SKS, we pride ourselves on being different.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
| 5 | 311 contacts → | ||||
Exact match “GI Outsourcing is a UK-based accountants outsourcing firm.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
| 6 | 146 contacts → | ||||
Exact match “At The Dot HQ, we empower businesses with a full spectrum of offshore resource solutions, ensuring efficiency, compliance and growth.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
| 7 | 108 contacts → | ||||
Exact match “As attention turns to the new fiscal year, accountants across the UK are finalising plans to boost growth and productivity and improve profitability.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
| 8 | 103 contacts → | ||||
Exact match “we redefine business process outsourcing, empowering companies to broaden their horizons.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
| 9 | 88 contacts → | ||||
Exact match “Founded in 2001 by lawyers, Global BPO provides bespoke legal and business services to law firms, professional service organisations and other businesses.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
| 10 | 70 contacts → | ||||
Exact match “We are a 400 member strong, specialist business process outsourcing (BPO) provider that caters to the diverse and complex information processing needs of todays corporation.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
| 11 | 64 contacts → | ||||
Exact match “At MPA, we exist to help business owners navigate the complex journey of scaling and exiting their businesses.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
| 12 | 53 contacts → | ||||
Exact match “Passle powers growth at the world's leading professional services firms, including Ropes & Gray, Linklaters, Quinn Emanuel and many more.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
| 13 | 47 contacts → | ||||
Exact match “Leading providers of specialist support services.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
| 14 | 42 contacts → | ||||
Exact match “Diacron Group provides accounting, tax and corporate services.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
| 15 | 41 contacts → | ||||
Exact match “Welcome to Factotum-your secret weapon for streamlined business success!” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
| 16 | 37 contacts → | ||||
Exact match “Rödl & Partner – The agile caring partner for Mittelstand shaped world market leaders As attorneys, tax advisers, management and IT consultants and auditors, we are present with…” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
| 17 | 37 contacts → | ||||
Exact match “Charles Marcus is our multinational network of consultancy firms.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
| 18 | 32 contacts → | ||||
Exact match “Jayva Global provides a comprehensive range of consultancy and training services to law firms and professional service organisations throughout the UK, USA, Ireland, New Zealand…” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
| 19 | 32 contacts → | ||||
Exact match “Briars - Scale Locally, Expand Globally 30 Years in Business, 150+ Years of Combined Expertise Trusted by Clients Global Coverage across 100+ Countries At Briars, we are your…” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
| 20 | 32 contacts → | ||||
Exact match “Almost every business can save time and money with smart outsourcing from Go-To - how much depends on you.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
| 21 | 31 contacts → | ||||
Exact match “Connect Systems are based in Chesham Bucks and were established in 1992 to provide professional IT services to the SMB market place.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
| 22 | 27 contacts → | ||||
Exact match “WTS Hansuke is a specialist professional services firm notable for its focus on excellent client service and agility.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
| 23 | 27 contacts → | ||||
Exact match “Now part of the Lawyers on Demand offering within the broader Consilio family.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
| 24 | 26 contacts → | ||||
Exact match “KBM Group was founded as a Chartered Certified Accountancy firm, offering advisory and consulting services for business start-ups and organizations looking to strengthen their…” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
| 25 | 24 contacts → | ||||
Exact match “Oakford Advisors Ltd, a Centralis Group company, is an outsourced business services firm which specialises in providing back-office support to start-up or existing companies…” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase | |||||
RevenueBase SmartSearch
Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.
This list uses Exact for “professional services outsourcing firms”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.
Showing 25 of 517 professional services outsourcing firms based in the United Kingdom
See the full list, filter by size, metro and specialty, and access 1,808 tracked professional contacts with verified work emails. Direct dials are available where recorded.
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Professional services outsourcing firms based in the United Kingdom at a glance
As of Sep 29, 2026Companies by employee count
Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 517 companies.
How this list was built
The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.
- Source
- The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
- What qualifies
- Company records associated with the United Kingdom whose business descriptions match “professional services outsourcing firms” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
- RevenueBase SmartSearch
- Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
- Public preview
- The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
- Match quality
- RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
- Ranking
- Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
- Verification
- Every displayed company carries at least one verified work email. RevenueBase tracks 1,808 professional contacts with verified work emails across the full matched dataset. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
- Refresh
- This page's figures were pulled from the company graph on September 29, 2026. Lists refresh periodically as the graph is re-checked.
- Record context
- Company records and descriptions can change. Check the company's website for its current services and locations.
Professional services outsourcing firms by metro
Frequently asked
What is RevenueBase SmartSearch?
RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “professional services outsourcing firms”; each Exact match badge shows search membership, not an individual similarity or quality score.
How many professional services outsourcing firms are there based in the United Kingdom?
RevenueBase identified 517 company matches for professional services outsourcing firms associated with the United Kingdom as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.
What is the largest company on this list?
Oliver James tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.
Which city has the most professional services outsourcing firms?
London leads with 205 company records, followed by Manchester (17) and Birmingham (10).
How do I get contact information for these companies?
A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 1,808 professional contacts with verified work emails tracked across these 517 companies; direct dials are available where recorded.
How current is this list?
The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 29, 2026.
Ready to reach these companies? Verified emails and direct dials for all 517 professional services outsourcing firms based in the United Kingdom. Start with a free account, no credit card.
Download this list →Related lists
Professional services outsourcing firms by geography
- Professional services outsourcing firms based in Buenos Aires, Argentina
- Professional services outsourcing firms based in Melbourne, Australia
- Professional services outsourcing firms based in Sydney, Australia
- Professional services outsourcing firms based in Barueri, Brazil
- Professional services outsourcing firms based in Belo Horizonte, Brazil
- Professional services outsourcing firms based in Campinas, Brazil
- Professional services outsourcing firms based in Porto Alegre, Brazil
- Professional services outsourcing firms based in Rio De Janeiro, Brazil
- Professional services outsourcing firms based in Sao Paulo, Brazil
- Professional services outsourcing firms based in Toronto, Canada
- Professional services outsourcing firms based in Santiago, Chile
- Professional services outsourcing firms based in Paris, France
About this data
RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase SmartSearch, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.
More company lists
- All company lists
- Lists by location
- Lists A-Z
- New lists
- Professional services outsourcing firms based in Buenos Aires, Argentina
- Professional services outsourcing firms based in Melbourne, Australia
- Professional services outsourcing firms based in Sydney, Australia
- Professional services outsourcing firms based in Barueri, Brazil
- Professional services outsourcing firms based in Belo Horizonte, Brazil
- Professional services outsourcing firms based in Campinas, Brazil
Company intelligence · public preview
Top 25 professional services outsourcing firms based in the United Kingdom
Find companies in any niche.
Describe the businesses you want in your own words. RevenueBase SmartSearch matches company descriptions by meaning.
RevenueBase records 517 matching company records for professional services outsourcing firms based in the United Kingdom, with 5,840 tracked contacts and 1,808 verified work emails.
This public preview shows 25 selected records ordered by tracked contacts. RevenueBase SmartSearch finds company descriptions that match by meaning at Exact. Snapshot: September 29, 2026.
RevenueBase compiles business descriptions for niche-company discovery; each row shows a recorded excerpt where available. Adapt this search to find the companies and contacts you want.
Top 25 professional services outsourcing firms based in the United Kingdom
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
| # | Company | Headquarters on record | Reported employees | RevenueBase SmartSearch | Tracked contacts |
|---|---|---|---|---|---|
| 1 |  Oliver Jamesoliverjames.comHQ: Manchester, United KingdomReported employees: 501-1,000 | Manchester, United Kingdom | 501-1,000 | Exact match | 870 contacts → |
“At Oliver James, we deliver flexible hiring solutions tailored to your business needs across financial services, professional services, commerce & industry.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 |  Outbooksoutbooks.co.ukHQ: Harrow, United KingdomReported employees: 201-500 | Harrow, United Kingdom | 201-500 | Exact match | 477 contacts → |
“Outbooks is a leading provider of outsourcing services to accounting and bookkeeping firms.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 |  Ubique Systemsubique-systems.comHQ: London, United KingdomReported employees: 501-1,000 | London, United Kingdom | 501-1,000 | Exact match | 333 contacts → |
“Ubique Systems is a fast growing multifaceted organization which offers a comprehensive array of outsourcing and consulting services for its customers, including recruitment…” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 |  SKS Business Servicessksbusinessservices.comHQ: London, United KingdomReported employees: 501-1,000 | London, United Kingdom | 501-1,000 | Exact match | 322 contacts → |
“At SKS, we pride ourselves on being different.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 |  GI Outsourcinggioutsourcing.comHQ: London, United KingdomReported employees: 201-500 | London, United Kingdom | 201-500 | Exact match | 311 contacts → |
“GI Outsourcing is a UK-based accountants outsourcing firm.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 |  The DOT HQthedothq.comHQ: Milton Keynes, United KingdomReported employees: 51-200 | Milton Keynes, United Kingdom | 51-200 | Exact match | 146 contacts → |
“At The Dot HQ, we empower businesses with a full spectrum of offshore resource solutions, ensuring efficiency, compliance and growth.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 | Initor Global UKinitor-global.co.uk HQ: London, United KingdomReported employees: 51-200 | London, United Kingdom | 51-200 | Exact match | 108 contacts → |
“As attention turns to the new fiscal year, accountants across the UK are finalising plans to boost growth and productivity and improve profitability.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 |  Solvex Solutionssolvex-solutions.comHQ: London, United KingdomReported employees: 201-500 | London, United Kingdom | 201-500 | Exact match | 103 contacts → |
“we redefine business process outsourcing, empowering companies to broaden their horizons.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 |  Global BPOglobalbpo.co.ukHQ: London, United KingdomReported employees: 51-200 | London, United Kingdom | 51-200 | Exact match | 88 contacts → |
“Founded in 2001 by lawyers, Global BPO provides bespoke legal and business services to law firms, professional service organisations and other businesses.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 |  Xanadutecxanadutec.comHQ: London, United KingdomReported employees: 201-500 | London, United Kingdom | 201-500 | Exact match | 70 contacts → |
“We are a 400 member strong, specialist business process outsourcing (BPO) provider that caters to the diverse and complex information processing needs of todays corporation.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 |  MPAmpa.co.ukHQ: Cranfield, United KingdomReported employees: 11-50 | Cranfield, United Kingdom | 11-50 | Exact match | 64 contacts → |
“At MPA, we exist to help business owners navigate the complex journey of scaling and exiting their businesses.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 |  Passlepassle.aiHQ: Oxford, United KingdomReported employees: 11-50 | Oxford, United Kingdom | 11-50 | Exact match | 53 contacts → |
“Passle powers growth at the world's leading professional services firms, including Ropes & Gray, Linklaters, Quinn Emanuel and many more.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 |  Industry Resource Services IRS Groupirs-group.co.ukHQ: Beccles, United KingdomReported employees: 11-50 | Beccles, United Kingdom | 11-50 | Exact match | 47 contacts → |
“Leading providers of specialist support services.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 |  Diacron Groupdiacrongroup.comHQ: London, United KingdomReported employees: 51-200 | London, United Kingdom | 51-200 | Exact match | 42 contacts → |
“Diacron Group provides accounting, tax and corporate services.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 |  Factotumfactotum.comHQ: London, United KingdomReported employees: 51-200 | London, United Kingdom | 51-200 | Exact match | 41 contacts → |
“Welcome to Factotum-your secret weapon for streamlined business success!” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 |  Rödl & Partner UKroedl.comHQ: Birmingham, United KingdomReported employees: Not recorded | Birmingham, United Kingdom | Not recorded | Exact match | 37 contacts → |
“Rödl & Partner – The agile caring partner for Mittelstand shaped world market leaders As attorneys, tax advisers, management and IT consultants and auditors, we are present with…” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 |  Charles Marcuscharlesmarcus.comHQ: London, United KingdomReported employees: 201-500 | London, United Kingdom | 201-500 | Exact match | 37 contacts → |
“Charles Marcus is our multinational network of consultancy firms.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 |  Jayva Globaljayvaglobal.comHQ: Manchester, United KingdomReported employees: 11-50 | Manchester, United Kingdom | 11-50 | Exact match | 32 contacts → |
“Jayva Global provides a comprehensive range of consultancy and training services to law firms and professional service organisations throughout the UK, USA, Ireland, New Zealand…” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 | Briarsbriarsgroup.com HQ: Warrington, United KingdomReported employees: 51-200 | Warrington, United Kingdom | 51-200 | Exact match | 32 contacts → |
“Briars - Scale Locally, Expand Globally 30 Years in Business, 150+ Years of Combined Expertise Trusted by Clients Global Coverage across 100+ Countries At Briars, we are your…” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 | Go-To Outsourcinggo-to-outsourcing.com HQ: Bromsgrove, United KingdomReported employees: 11-50 | Bromsgrove, United Kingdom | 11-50 | Exact match | 32 contacts → |
“Almost every business can save time and money with smart outsourcing from Go-To - how much depends on you.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 |  Connect Systems LTDconnectsys.co.ukHQ: Chesham, United KingdomReported employees: 11-50 | Chesham, United Kingdom | 11-50 | Exact match | 31 contacts → |
“Connect Systems are based in Chesham Bucks and were established in 1992 to provide professional IT services to the SMB market place.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 |  WTS Hansukewtshansuke.co.ukHQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 27 contacts → |
“WTS Hansuke is a specialist professional services firm notable for its focus on excellent client service and agility.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 |  Paralaw A Consilio Companyparalaw.co.ukHQ: London, United KingdomReported employees: 51-200 | London, United Kingdom | 51-200 | Exact match | 27 contacts → |
“Now part of the Lawyers on Demand offering within the broader Consilio family.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 |  KBM Groupkbmgroup.co.ukHQ: London, United KingdomReported employees: 51-200 | London, United Kingdom | 51-200 | Exact match | 26 contacts → |
“KBM Group was founded as a Chartered Certified Accountancy firm, offering advisory and consulting services for business start-ups and organizations looking to strengthen their…” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 |  Oakford Advisors LTDoakfordadvisors.comHQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 24 contacts → |
“Oakford Advisors Ltd, a Centralis Group company, is an outsourced business services firm which specialises in providing back-office support to start-up or existing companies…” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 517 company matches
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Professional services outsourcing firms: dataset insights
September 29, 2026These summaries describe recorded coverage in this saved dataset. This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Reported company sizes
514 records in the displayed employee bands.
3 matching records are outside the displayed bands or do not have a displayed size. Bars show shares of the displayed bands.
Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 517 companies.
How this company list was built
Describe a niche in your own words: companies installing commercial solar, or manufacturers of sustainable packaging. RevenueBase SmartSearch finds companies whose compiled business descriptions match by meaning. This list is one saved example to adapt.
Where the company descriptions come from
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
RevenueBase SmartSearch matching settings
- Exact
- Closest fits to the business described.
- Similar
- Similar businesses with a wider range of fits.
- Related
- Related businesses in and around the category.
- Broad
- A broader set of businesses connected to the description.
RevenueBase SmartSearch · Exact match identifies inclusion in this search's closest semantic matching setting. It is not a per-company confidence score, a literal keyword match, or a quality endorsement.
Selection, ordering and scope
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Recorded company descriptions support research; check company websites for current services. The selected preview is ordered by tracked contacts and is not a list of the best service providers.
Snapshot: September 29, 2026.
RevenueBase is a B2B data infrastructure company. Its September 3, 2026 published methodology describes a graph of 60 million companies and 398.9 million professional contacts; these platform figures differ from this page's totals. Published methodology ↗
Professional services outsourcing firms by metro
Questions about this company list
What does Exact match mean for professional services outsourcing firms?
The separate RevenueBase SmartSearch column identifies inclusion at the closest semantic matching preset. It is not a literal keyword match, a per-company confidence score or a quality endorsement. Changing the search form opens a new search in RevenueBase; it does not reclassify these saved rows.
How many professional services outsourcing firms did RevenueBase find based in the United Kingdom?
The saved snapshot records 517 matching company records, 5,840 tracked contacts and 1,808 verified emails. The public preview displays 25 selected records.
Where do the company descriptions come from?
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
How are the public companies ordered?
The selected public records are ordered by contacts tracked in RevenueBase, highest first. Contact coverage is a prospecting measure, not an assessment of the company's services or quality.
How can I get contact information?
Select a company's contact count to open its filtered contacts in RevenueBase. Free signup is required and includes 500 credits and limited free results. Verified emails, direct dials and mobile numbers depend on available coverage.
How current is this list?
Snapshot: September 29, 2026. Review each company's website for current services and locations. A recorded business description does not establish that every company offers every service named in the search.
What do headquarters and employee bands mean?
These are recorded company-level fields, rather than a map of every branch or a count of specialists. Missing headquarters or employee bands are labeled; older records may show a location separately from recorded headquarters.
Build your next target company list
Adapt this niche search and work with available contacts in RevenueBase.
Related lists
Professional services outsourcing firms by geography
- Professional services outsourcing firms based in Buenos Aires, Argentina
- Professional services outsourcing firms based in Melbourne, Australia
- Professional services outsourcing firms based in Sydney, Australia
- Professional services outsourcing firms based in Barueri, Brazil
- Professional services outsourcing firms based in Belo Horizonte, Brazil
- Professional services outsourcing firms based in Campinas, Brazil
- Professional services outsourcing firms based in Porto Alegre, Brazil
- Professional services outsourcing firms based in Rio De Janeiro, Brazil
- Professional services outsourcing firms based in Sao Paulo, Brazil
- Professional services outsourcing firms based in Toronto, Canada
- Professional services outsourcing firms based in Santiago, Chile
- Professional services outsourcing firms based in Paris, France
Cite this list
RevenueBase Data Team. Top 25 professional services outsourcing firms based in the United Kingdom. Snapshot: September 29, 2026. https://revenuebase.ai/companies/professional-services-outsourcing-firms/united-kingdom.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗
More company lists
- All company lists
- Lists by location
- Lists A-Z
- New lists
- Professional services outsourcing firms based in Buenos Aires, Argentina
- Professional services outsourcing firms based in Melbourne, Australia
- Professional services outsourcing firms based in Sydney, Australia
- Professional services outsourcing firms based in Barueri, Brazil
- Professional services outsourcing firms based in Belo Horizonte, Brazil
- Professional services outsourcing firms based in Campinas, Brazil
Company intelligence · public preview
Top 25 professional services outsourcing firms based in the United Kingdom
RevenueBase records 517 matching company records for professional services outsourcing firms based in the United Kingdom, with 5,840 tracked contacts and 1,808 verified work emails.
This public preview shows 25 selected records ordered by tracked contacts. RevenueBase SmartSearch finds company descriptions that match by meaning at Exact. Snapshot: September 29, 2026.
RevenueBase compiles business descriptions for niche-company discovery; each row shows a recorded excerpt where available. Adapt this search to find the companies and contacts you want.
Top 25 professional services outsourcing firms based in the United Kingdom
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
| # | Company | Headquarters on record | Reported employees | RevenueBase SmartSearch | Tracked contacts |
|---|---|---|---|---|---|
| 1 | Oliver Jamesoliverjames.com HQ: Manchester, United KingdomReported employees: 501-1,000 | Manchester, United Kingdom | 501-1,000 | Exact match | 870 contacts → |
“At Oliver James, we deliver flexible hiring solutions tailored to your business needs across financial services, professional services, commerce & industry.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 2 | Outbooksoutbooks.co.uk HQ: Harrow, United KingdomReported employees: 201-500 | Harrow, United Kingdom | 201-500 | Exact match | 477 contacts → |
“Outbooks is a leading provider of outsourcing services to accounting and bookkeeping firms.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 3 | Ubique Systemsubique-systems.com HQ: London, United KingdomReported employees: 501-1,000 | London, United Kingdom | 501-1,000 | Exact match | 333 contacts → |
“Ubique Systems is a fast growing multifaceted organization which offers a comprehensive array of outsourcing and consulting services for its customers, including recruitment…” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 4 | SKS Business Servicessksbusinessservices.com HQ: London, United KingdomReported employees: 501-1,000 | London, United Kingdom | 501-1,000 | Exact match | 322 contacts → |
“At SKS, we pride ourselves on being different.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 5 | GI Outsourcinggioutsourcing.com HQ: London, United KingdomReported employees: 201-500 | London, United Kingdom | 201-500 | Exact match | 311 contacts → |
“GI Outsourcing is a UK-based accountants outsourcing firm.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 6 | The DOT HQthedothq.com HQ: Milton Keynes, United KingdomReported employees: 51-200 | Milton Keynes, United Kingdom | 51-200 | Exact match | 146 contacts → |
“At The Dot HQ, we empower businesses with a full spectrum of offshore resource solutions, ensuring efficiency, compliance and growth.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 7 | Initor Global UKinitor-global.co.uk HQ: London, United KingdomReported employees: 51-200 | London, United Kingdom | 51-200 | Exact match | 108 contacts → |
“As attention turns to the new fiscal year, accountants across the UK are finalising plans to boost growth and productivity and improve profitability.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 8 | Solvex Solutionssolvex-solutions.com HQ: London, United KingdomReported employees: 201-500 | London, United Kingdom | 201-500 | Exact match | 103 contacts → |
“we redefine business process outsourcing, empowering companies to broaden their horizons.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 9 | Global BPOglobalbpo.co.uk HQ: London, United KingdomReported employees: 51-200 | London, United Kingdom | 51-200 | Exact match | 88 contacts → |
“Founded in 2001 by lawyers, Global BPO provides bespoke legal and business services to law firms, professional service organisations and other businesses.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 10 | Xanadutecxanadutec.com HQ: London, United KingdomReported employees: 201-500 | London, United Kingdom | 201-500 | Exact match | 70 contacts → |
“We are a 400 member strong, specialist business process outsourcing (BPO) provider that caters to the diverse and complex information processing needs of todays corporation.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 11 | MPAmpa.co.uk HQ: Cranfield, United KingdomReported employees: 11-50 | Cranfield, United Kingdom | 11-50 | Exact match | 64 contacts → |
“At MPA, we exist to help business owners navigate the complex journey of scaling and exiting their businesses.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 12 | Passlepassle.ai HQ: Oxford, United KingdomReported employees: 11-50 | Oxford, United Kingdom | 11-50 | Exact match | 53 contacts → |
“Passle powers growth at the world's leading professional services firms, including Ropes & Gray, Linklaters, Quinn Emanuel and many more.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 13 | Industry Resource Services IRS Groupirs-group.co.uk HQ: Beccles, United KingdomReported employees: 11-50 | Beccles, United Kingdom | 11-50 | Exact match | 47 contacts → |
“Leading providers of specialist support services.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 14 | Diacron Groupdiacrongroup.com HQ: London, United KingdomReported employees: 51-200 | London, United Kingdom | 51-200 | Exact match | 42 contacts → |
“Diacron Group provides accounting, tax and corporate services.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 15 | Factotumfactotum.com HQ: London, United KingdomReported employees: 51-200 | London, United Kingdom | 51-200 | Exact match | 41 contacts → |
“Welcome to Factotum-your secret weapon for streamlined business success!” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 16 | Rödl & Partner UKroedl.com HQ: Birmingham, United KingdomReported employees: Not recorded | Birmingham, United Kingdom | Not recorded | Exact match | 37 contacts → |
“Rödl & Partner – The agile caring partner for Mittelstand shaped world market leaders As attorneys, tax advisers, management and IT consultants and auditors, we are present with…” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 17 | Charles Marcuscharlesmarcus.com HQ: London, United KingdomReported employees: 201-500 | London, United Kingdom | 201-500 | Exact match | 37 contacts → |
“Charles Marcus is our multinational network of consultancy firms.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 18 | Jayva Globaljayvaglobal.com HQ: Manchester, United KingdomReported employees: 11-50 | Manchester, United Kingdom | 11-50 | Exact match | 32 contacts → |
“Jayva Global provides a comprehensive range of consultancy and training services to law firms and professional service organisations throughout the UK, USA, Ireland, New Zealand…” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 19 | Briarsbriarsgroup.com HQ: Warrington, United KingdomReported employees: 51-200 | Warrington, United Kingdom | 51-200 | Exact match | 32 contacts → |
“Briars - Scale Locally, Expand Globally 30 Years in Business, 150+ Years of Combined Expertise Trusted by Clients Global Coverage across 100+ Countries At Briars, we are your…” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 20 | Go-To Outsourcinggo-to-outsourcing.com HQ: Bromsgrove, United KingdomReported employees: 11-50 | Bromsgrove, United Kingdom | 11-50 | Exact match | 32 contacts → |
“Almost every business can save time and money with smart outsourcing from Go-To - how much depends on you.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 21 | Connect Systems LTDconnectsys.co.uk HQ: Chesham, United KingdomReported employees: 11-50 | Chesham, United Kingdom | 11-50 | Exact match | 31 contacts → |
“Connect Systems are based in Chesham Bucks and were established in 1992 to provide professional IT services to the SMB market place.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 22 | WTS Hansukewtshansuke.co.uk HQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 27 contacts → |
“WTS Hansuke is a specialist professional services firm notable for its focus on excellent client service and agility.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 23 | Paralaw A Consilio Companyparalaw.co.uk HQ: London, United KingdomReported employees: 51-200 | London, United Kingdom | 51-200 | Exact match | 27 contacts → |
“Now part of the Lawyers on Demand offering within the broader Consilio family.” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 24 | KBM Groupkbmgroup.co.uk HQ: London, United KingdomReported employees: 51-200 | London, United Kingdom | 51-200 | Exact match | 26 contacts → |
“KBM Group was founded as a Chartered Certified Accountancy firm, offering advisory and consulting services for business start-ups and organizations looking to strengthen their…” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
| 25 | Oakford Advisors LTDoakfordadvisors.com HQ: London, United KingdomReported employees: 11-50 | London, United Kingdom | 11-50 | Exact match | 24 contacts → |
“Oakford Advisors Ltd, a Centralis Group company, is an outsourced business services firm which specialises in providing back-office support to start-up or existing companies…” Recorded description excerpt · September 29, 2026Open company data in RevenueBase ↗Free signup required. | |||||
Showing 25 of 517 company matches
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Professional services outsourcing firms: dataset insights
September 29, 2026These summaries describe recorded coverage in this saved dataset. This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Reported company sizes
514 records in the displayed employee bands.
3 matching records are outside the displayed bands or do not have a displayed size. Bars show shares of the displayed bands.
Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 517 companies.
How this company list was built
Describe a niche in your own words: companies installing commercial solar, or manufacturers of sustainable packaging. RevenueBase SmartSearch finds companies whose compiled business descriptions match by meaning. This list is one saved example to adapt.
Where the company descriptions come from
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
RevenueBase SmartSearch matching settings
- Exact
- Closest fits to the business described.
- Similar
- Similar businesses with a wider range of fits.
- Related
- Related businesses in and around the category.
- Broad
- A broader set of businesses connected to the description.
RevenueBase SmartSearch · Exact match identifies inclusion in this search's closest semantic matching setting. It is not a per-company confidence score, a literal keyword match, or a quality endorsement.
Selection, ordering and scope
The public list shows selected company records with contact and verified-email coverage. Reported employee bands provide separate company-size context.
This page is derived from saved source records; per-contact mobile coverage and email-recency results are not established by this snapshot.
Recorded company descriptions support research; check company websites for current services. The selected preview is ordered by tracked contacts and is not a list of the best service providers.
Snapshot: September 29, 2026.
RevenueBase is a B2B data infrastructure company. Its September 3, 2026 published methodology describes a graph of 60 million companies and 398.9 million professional contacts; these platform figures differ from this page's totals. Published methodology ↗
Professional services outsourcing firms by metro
Questions about this company list
What does Exact match mean for professional services outsourcing firms?
The separate RevenueBase SmartSearch column identifies inclusion at the closest semantic matching preset. It is not a literal keyword match, a per-company confidence score or a quality endorsement. Changing the search form opens a new search in RevenueBase; it does not reclassify these saved rows.
How many professional services outsourcing firms did RevenueBase find based in the United Kingdom?
The saved snapshot records 517 matching company records, 5,840 tracked contacts and 1,808 verified emails. The public preview displays 25 selected records.
Where do the company descriptions come from?
RevenueBase compiles company information from public sources, including company websites and public professional profiles such as LinkedIn, alongside information supplied by companies. The short recorded excerpt shown here is separate from the complete business description used for matching; individual source URLs and collection dates are not provided in this public snapshot.
How are the public companies ordered?
The selected public records are ordered by contacts tracked in RevenueBase, highest first. Contact coverage is a prospecting measure, not an assessment of the company's services or quality.
How can I get contact information?
Select a company's contact count to open its filtered contacts in RevenueBase. Free signup is required and includes 500 credits and limited free results. Verified emails, direct dials and mobile numbers depend on available coverage.
How current is this list?
Snapshot: September 29, 2026. Review each company's website for current services and locations. A recorded business description does not establish that every company offers every service named in the search.
What do headquarters and employee bands mean?
These are recorded company-level fields, rather than a map of every branch or a count of specialists. Missing headquarters or employee bands are labeled; older records may show a location separately from recorded headquarters.
Build your next target company list
Adapt this niche search and work with available contacts in RevenueBase.
Related lists
Professional services outsourcing firms by geography
- Professional services outsourcing firms based in Buenos Aires, Argentina
- Professional services outsourcing firms based in Melbourne, Australia
- Professional services outsourcing firms based in Sydney, Australia
- Professional services outsourcing firms based in Barueri, Brazil
- Professional services outsourcing firms based in Belo Horizonte, Brazil
- Professional services outsourcing firms based in Campinas, Brazil
- Professional services outsourcing firms based in Porto Alegre, Brazil
- Professional services outsourcing firms based in Rio De Janeiro, Brazil
- Professional services outsourcing firms based in Sao Paulo, Brazil
- Professional services outsourcing firms based in Toronto, Canada
- Professional services outsourcing firms based in Santiago, Chile
- Professional services outsourcing firms based in Paris, France
Cite this list
RevenueBase Data Team. Top 25 professional services outsourcing firms based in the United Kingdom. Snapshot: September 29, 2026. https://revenuebase.ai/companies/professional-services-outsourcing-firms/united-kingdom.
This is a selected public preview of saved company records, rather than an independently verified census. Open the source page ↗
More company lists
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- New lists
- Professional services outsourcing firms based in Buenos Aires, Argentina
- Professional services outsourcing firms based in Melbourne, Australia
- Professional services outsourcing firms based in Sydney, Australia
- Professional services outsourcing firms based in Barueri, Brazil
- Professional services outsourcing firms based in Belo Horizonte, Brazil
- Professional services outsourcing firms based in Campinas, Brazil