Company lists · Data refreshed September 2026

Top 25 Admin outsourcing companies based in the United Kingdom

Name: Admin outsourcing companies based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 598 companies tracked

RevenueBase identified 598 admin outsourcing companies headquartered in the United Kingdom as of September 2026 and tracks 3,118 professional contacts across them, including 746 with verified work emails. London is the largest hub.

This list covers admin outsourcing companies headquartered in the United Kingdom, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 21, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, 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.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 21, 2026 86% judged on-target in blind review

598Companies

3,118Contacts tracked

746Verified emails

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The 25 largest admin outsourcing companies based in the United Kingdom

Ranked by team size

Top 25 of 598 admin outsourcing companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to admin outsourcing companies: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Outbooks	Partial evidence	Harrow, United KingdomHQ checked Sep 21, 2026	201-500	477 contacts →
	Partial evidence “Outbooks is a leading provider of outsourcing services to accounting and bookkeeping firms.” Source: RevenueBase Database · checked Sep 21, 2026
2	GI Outsourcing	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	201-500	311 contacts →
	Partial evidence “GI Outsourcing is a UK-based accountants outsourcing firm.” Source: RevenueBase Database · checked Sep 21, 2026
3	Solvex Solutions	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	201-500	103 contacts →
	Partial evidence “we redefine business process outsourcing, empowering companies to broaden their horizons.” Source: RevenueBase Database · checked Sep 21, 2026
4	SOLVD	Indirect evidence	Glasgow, United KingdomHQ checked Sep 21, 2026	51-200	74 contacts →
	Indirect evidence “Streamline your business with our bespoke support services.” Source: RevenueBase Database · checked Sep 21, 2026
5	Payescape LTD	Indirect evidence	Northern Ireland, United KingdomHQ checked Sep 21, 2026	51-200	67 contacts →
	Indirect evidence “PayEscape is one of the UK’s fastest growing outsourced Payroll, HR and Time Management providers.” Source: RevenueBase Database · checked Sep 21, 2026
6	GET Ahead	Indirect evidence	Godalming, United KingdomHQ checked Sep 21, 2026	11-50	49 contacts →
	Indirect evidence “Get Ahead is a trusted partner for busy business owners who want high-quality, flexible support without the cost and commitment of hiring full-time staff.” Source: RevenueBase Database · checked Sep 21, 2026
7	Industry Resource Services IRS Group	Indirect evidence	Beccles, United KingdomHQ checked Sep 21, 2026	11-50	47 contacts →
	Indirect evidence “Leading providers of specialist support services.” Source: RevenueBase Database · checked Sep 21, 2026
8	Factotum	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	41 contacts →
	Indirect evidence “Welcome to Factotum-your secret weapon for streamlined business success!” Source: RevenueBase Database · checked Sep 21, 2026
9	Go-To Outsourcing	Partial evidence	Bromsgrove, United KingdomHQ checked Sep 21, 2026	11-50	32 contacts →
	Partial evidence “Almost every business can save time and money with smart outsourcing from Go-To - how much depends on you.” Source: RevenueBase Database · checked Sep 21, 2026
10	Utopian VA LTD	Indirect evidence	Wolverhampton, United KingdomHQ checked Sep 21, 2026	11-50	29 contacts →
	Indirect evidence “We help Ecommerce Business Owners automate their day-to-day operations by hiring, training and managing Virtual Assistants (VA) who have been specially trained to manage Ecommerce…” Source: RevenueBase Database · checked Sep 21, 2026
11	Freedom Outsourcing	Partial evidence	Sutton Coldfield, United KingdomHQ checked Sep 21, 2026	11-50	25 contacts →
	Partial evidence “At Freedom Outsourcing, we specialise in Business Process Outsourcing (BPO) to help businesses save money and grow faster with UK managed outsourcing solutions.” Source: RevenueBase Database · checked Sep 21, 2026
12	Oakford Advisors LTD	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	24 contacts →
	Indirect evidence “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…” Source: RevenueBase Database · checked Sep 21, 2026
13	Paragon Scotland Limited	Partial evidence	Doncaster, United KingdomHQ checked Sep 21, 2026	51-200	24 contacts →
	Partial evidence “Welcome to Paragon Scotland Limited, where we provide comprehensive white-labelled admin, marketing, and customer support services to help businesses maintain a professional image…” Source: RevenueBase Database · checked Sep 21, 2026
14	Propact Solutions	Partial evidence	Birmingham, United KingdomHQ checked Sep 21, 2026	11-50	22 contacts →
	Partial evidence “If you run an accountancy or bookkeeping firm, we can help you overcome your staff recruitment and retention challenges with our outsourcing and offshoring solutions that are…” Source: RevenueBase Database · checked Sep 21, 2026
15	TOP Resource Group	Partial evidence	Preston, United KingdomHQ checked Sep 21, 2026	11-50	22 contacts →
	Partial evidence “Top Resource Group is your one-stop ally for all business outsourcing needs.” Source: RevenueBase Database · checked Sep 21, 2026
16	Payroll Sorted	Indirect evidence	Rayleigh, United KingdomHQ checked Sep 21, 2026	11-50	19 contacts →
	Indirect evidence “WOULD YOU LIKE TO REMOVE PAYROLL FROM YOUR PRACTICE?” Source: RevenueBase Database · checked Sep 21, 2026
17	AGO Outsourcing	Partial evidence	East Kilbride, United KingdomHQ checked Sep 21, 2026	51-200	19 contacts →
	Partial evidence “AGO Outsourcing is a leading provider of outsourced business services, including inbound and outbound customer service and outbound sales as well as social media engagement…” Source: RevenueBase Database · checked Sep 21, 2026
18	Magna Group	Indirect evidence	Leeds, United KingdomHQ checked Sep 21, 2026	1-10	17 contacts →
	Indirect evidence “We combine the perfect mix of industry-leading technology and personnel to support you in managing your workforce with greater efficiency than ever before.” Source: RevenueBase Database · checked Sep 21, 2026
19	FCL	Partial evidence	Waterlooville, United KingdomHQ checked Sep 21, 2026	11-50	17 contacts →
	Partial evidence “Flamingo Contracting Limited (FCL) operates as a business support function, offering payroll outsourcing and sub-contracting solutions to companies wishing to focus their valuable…” Source: RevenueBase Database · checked Sep 21, 2026
20	VIP Communications	Indirect evidence	Hessle, United KingdomHQ checked Sep 21, 2026	11-50	16 contacts →
	Indirect evidence “At VIP, we are committed to providing brilliant customer service, always putting our clients first.” Source: RevenueBase Database · checked Sep 21, 2026
21	Kimon Services	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	16 contacts →
	Indirect evidence “Kimon Services provides high-quality outsourced staff across various industries and disciplines, including customer service, data entry, call centres, marketing and sales support…” Source: RevenueBase Database · checked Sep 21, 2026
22	Backoffice Nationwide LTD	Indirect evidence	Selby, United KingdomHQ checked Sep 21, 2026	11-50	15 contacts →
	Indirect evidence “Here at Backoffice we offer a choice of services designed to meet both the agency and operative’s needs.” Source: RevenueBase Database · checked Sep 21, 2026
23	Withall & CO LTD	Indirect evidence	West Wickham, United KingdomHQ checked Sep 21, 2026	11-50	15 contacts →
	Indirect evidence “When you engage us to act as your outsourced finance team, we not only provide financial and business support, but in conjunction with our wider community of legal experts and tax…” Source: RevenueBase Database · checked Sep 21, 2026
24	Modina	Partial evidence	Hitchin, United KingdomHQ checked Sep 21, 2026	1-10	14 contacts →
	Partial evidence “Modina is a friendly, professional outsourcing service dedicated to helping you stay in control of your bookkeeping and payroll.” Source: RevenueBase Database · checked Sep 21, 2026
25	Xcellency LTD	Indirect evidence	Maidstone, United KingdomHQ checked Sep 21, 2026	11-50	14 contacts →
	Indirect evidence “At Xcellency, we are dedicated to empowering accounting businesses to realise their fullest potential.” Source: RevenueBase Database · checked Sep 21, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: admin outsourcing companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names admin outsourcing companies.
Partial evidence: Its own public description names part of admin outsourcing companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name admin outsourcing companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 598 admin outsourcing companies based in the United Kingdom

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Admin outsourcing companies based in the United Kingdom at a glance

As of Sep 21, 2026

23.9%Verified-email coverage

5.2Average contacts per company

1-10Median size (employees)

21.2%Largest-city concentration · London

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

449

11-50

108

51-200

201-500

1,001-5,000

10001+

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 598 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among admin outsourcing companies, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in the United Kingdom whose own description of what they do matches “admin outsourcing companies”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names admin outsourcing companies), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among admin outsourcing companies, and records with no verified work email. Companies headquartered outside United Kingdom are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
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 listed company carries at least one verified work email, 746 across the full list. 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 21, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Admin outsourcing companies by metro

Admin outsourcing companies in London127

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names admin outsourcing companies, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many admin outsourcing companies are there based in the United Kingdom?

RevenueBase identified 598 admin outsourcing companies headquartered in the United Kingdom as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Outbooks, headquartered in London, tops this list with the largest team on record.

Which city has the most admin outsourcing companies?

London leads with 127 headquartered companies, followed by Manchester (17) and Leeds (9).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 746 verified decision-maker contacts tracked across these 598 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 21, 2026.

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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 Smart Search, 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.