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Company lists · Data refreshed September 2026

Top 25 Consultancy services based in the United Kingdom

Compiled by the RevenueBase Data Team Data refreshed Sep 24, 2026 29,151 companies tracked

RevenueBase identified 29,151 consultancy services headquartered in the United Kingdom as of September 2026 and tracks 211,198 professional contacts across them, including 80,212 with verified work emails and 16,311 with mobile numbers. London is the largest hub.

This list covers consultancy services 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 24, 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 24, 2026 86% judged on-target in blind review
29,151Companies
211,198Contacts tracked
80,212Verified emails
16,311Mobile numbers
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The 25 largest consultancy services based in the United Kingdom

Ranked by team size
Top 25 of 29,151 consultancy services based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 24, 2026. RevenueBase Smart Search rates how each company's information relates to consultancy services: 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.
#CompanyRevenueBase Smart SearchHeadquartersEmployeesContacts
1
Ey-Parthenon
Indirect evidenceLondon, United KingdomHQ checked Sep 24, 202610001+17,070 contacts →

Indirect evidence

“Our unique combination of transformative strategy, transactions and corporate finance delivers real-world value – solutions that work in practice, not just on paper.”

Source: RevenueBase Database · checked Sep 24, 2026
2
MACE
Indirect evidenceLondon, United KingdomHQ checked Sep 24, 20265,001-10,0008,458 contacts →

Indirect evidence

“Mace Consult launched as a new and independent business on 5 March 2026, through a carve-out from Mace Group.”

Source: RevenueBase Database · checked Sep 24, 2026
3
Baringa
Indirect evidenceLondon, United KingdomHQ checked Sep 24, 20261,001-5,0002,179 contacts →

Indirect evidence

“Baringa is a global consulting firm that helps leaders drive meaningful change and create value.”

Source: RevenueBase Database · checked Sep 24, 2026
4
TLT LLP
Indirect evidenceBristol, United KingdomHQ checked Sep 24, 20261,001-5,0001,797 contacts →

Indirect evidence

“We’re your business advisers as well as your lawyers, working in step with you to protect your interests today and progress your ambitions for tomorrow.”

Source: RevenueBase Database · checked Sep 24, 2026
5
Barnett Waddingham
Strong evidenceLondon, United KingdomHQ checked Sep 24, 20261,001-5,0001,331 contacts →

Strong evidence

“We are a leading UK professional services consultancy at the forefront of risk, pensions, investment and insurance.”

Source: RevenueBase Database · checked Sep 24, 2026
6
Blackmont Consulting
Indirect evidenceLondon, United KingdomHQ checked Sep 24, 2026201-5001,221 contacts →

Indirect evidence

“Blackmont Consulting provides 100% free advisory services to NGO´s, NPO´s and start-ups.”

Source: RevenueBase Database · checked Sep 24, 2026
7
True Potential LLP
Indirect evidenceNewcastle Upon Tyne, United KingdomHQ checked Sep 24, 2026501-1,0001,189 contacts →

Indirect evidence

“Through our industry leading technology and services, we power the businesses of 20% of the UK financial adviser market.”

Source: RevenueBase Database · checked Sep 24, 2026
8
Hoare LEA
Strong evidenceLondon, United KingdomHQ checked Sep 24, 2026501-1,0001,103 contacts →

Strong evidence

“We are an award-winning engineering consultancy with a creative team of engineers, designers, and technical specialists.”

Source: RevenueBase Database · checked Sep 24, 2026
9
Lambert Smith Hampton
Strong evidenceLondon, United KingdomHQ checked Sep 24, 20261,001-5,0001,016 contacts →

Strong evidence

“Lambert Smith Hampton (LSH) is one of the UK and Ireland's leading, and most progressive, property consultancies with 28 offices and 1,200 staff.”

Source: RevenueBase Database · checked Sep 24, 2026
10
Oc&c Strategy Consultants
Strong evidenceLondon, United KingdomHQ checked Sep 24, 2026501-1,0001,011 contacts →

Strong evidence

“At OC & C Strategy Consultants we have more than 35 years of experience at unpicking the most complex business challenges with simple, uncommon sense™.”

Source: RevenueBase Database · checked Sep 24, 2026
11
Oliver James
Indirect evidenceManchester, United KingdomHQ checked Sep 24, 2026501-1,000870 contacts →

Indirect evidence

“At Oliver James, we deliver flexible hiring solutions tailored to your business needs across financial services, professional services, commerce & industry.”

Source: RevenueBase Database · checked Sep 24, 2026
12
Pick Everard
Strong evidenceLeicester, United KingdomHQ checked Sep 24, 2026501-1,000795 contacts →

Strong evidence

“Pick Everard is a leading multi-professional consultancy working within the property, infrastructure and construction industry.”

Source: RevenueBase Database · checked Sep 24, 2026
13
PKF Littlejohn
Indirect evidenceLondon, United KingdomHQ checked Sep 24, 2026501-1,000702 contacts →

Indirect evidence

“We are a fast-growing firm of accountants and business advisers based in London’s Canary Wharf, Leeds and in Manchester.”

Source: RevenueBase Database · checked Sep 24, 2026
14
SDSD
Indirect evidenceLondon, United KingdomHQ checked Sep 24, 2026n/a681 contacts →

Indirect evidence

“SDSD - Supporting Maritime Professionals since 1983 Software innovation to the Maritime industry for more than 30 years.”

Source: RevenueBase Database · checked Sep 24, 2026
15
KBR Granherne
Strong evidenceLeatherhead, United KingdomHQ checked Sep 24, 2026501-1,000648 contacts →

Strong evidence

“KBR Consulting is one of the world's foremost engineering consultancies specializing in the hydrocarbon and energy industry.”

Source: RevenueBase Database · checked Sep 24, 2026
16
Tony GEE And Partners
Strong evidenceEsher, United KingdomHQ checked Sep 24, 2026501-1,000606 contacts →

Strong evidence

“Tony Gee is an award winning firm that provides specialist engineering consultancy services to the construction industry.”

Source: RevenueBase Database · checked Sep 24, 2026
17
Dalcour Maclaren
Indirect evidenceChesterton, United KingdomHQ checked Sep 24, 2026501-1,000589 contacts →

Indirect evidence

“Dalcour Maclaren: delivering land, stakeholder and environmental solutions.”

Source: RevenueBase Database · checked Sep 24, 2026
18
Pegasus Group
Indirect evidenceLichfield, United KingdomHQ checked Sep 24, 2026201-500580 contacts →

Indirect evidence

“Since 2003, we’ve been solving planning and development problems for our clients successfully.”

Source: RevenueBase Database · checked Sep 24, 2026
19
Waterman Group
Strong evidenceLondon, United KingdomHQ checked Sep 24, 20261,001-5,000563 contacts →

Strong evidence

“Waterman Group is a multidisciplinary consultancy providing sustainable solutions to meet the planning, engineering design and project delivery needs of the property…”

Source: RevenueBase Database · checked Sep 24, 2026
20
Alten LTD - UK
Strong evidenceLondon, United KingdomHQ checked Sep 24, 202610001+529 contacts →

Strong evidence

“We are a leading Engineering and IT consultancy operating across all sectors in 30 different countries.”

Source: RevenueBase Database · checked Sep 24, 2026
21
Strategy Insights
Strong evidenceLondon, United KingdomHQ checked Sep 24, 202651-200528 contacts →

Strong evidence

“Strategy Insights is a specialist business and economic development consultancy.”

Source: RevenueBase Database · checked Sep 24, 2026
22
STEER
Indirect evidenceLondon, United KingdomHQ checked Sep 24, 2026201-500524 contacts →

Indirect evidence

“Complex challenges.”

Source: RevenueBase Database · checked Sep 24, 2026
23
Price Bailey
Indirect evidenceBishop's Stortford, United KingdomHQ checked Sep 24, 2026201-500500 contacts →

Indirect evidence

“Price Bailey is a leading firm of chartered accountants and business advisers with offices across East Anglia, London, and a strategic presence overseas, serving local SMEs…”

Source: RevenueBase Database · checked Sep 24, 2026
24
Broadstone
Strong evidenceLondon, United KingdomHQ checked Sep 24, 2026501-1,000497 contacts →

Strong evidence

“Broadstone is a leading, independent UK consultancy delivering expert advice to employers, insurers, pension scheme trustees and lenders.”

Source: RevenueBase Database · checked Sep 24, 2026
25
Aspens Services LTD
Indirect evidenceLondon, United KingdomHQ checked Sep 24, 20265,001-10,000497 contacts →

Indirect evidence

“We are a catering company who specialise in the education sector.”

Source: RevenueBase Database · checked Sep 24, 2026

Showing 25 of 29,151 consultancy services based in the United Kingdom

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Consultancy services based in the United Kingdom at a glance

As of Sep 24, 2026
38.0%Verified-email coverage
7.7%Mobile-number coverage
7.2Average contacts per company
1-10Median size (employees)
30.5%Largest-city concentration · London
Sep 24, 2026Page data refreshed

Companies by employee count

1-10
23,631
11-50
4,277
51-200
847
201-500
141
501-1,000
47
1,001-5,000
38
5,001-10,000
9
10001+
15

Freshness & accuracy

How recently the business emails were verified and the company information checked

Email last verified

Median 26.0d

Company record updated

Median 76.0d

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 consultancy services, 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 “consultancy services”. 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 consultancy services), 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 consultancy services, 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, 80,212 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 24, 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.

Consultancy services by metro

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 consultancy services, 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 consultancy services are there based in the United Kingdom?

RevenueBase identified 29,151 consultancy services 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?

Ey-Parthenon, headquartered in London, tops this list with the largest team on record.

Which city has the most consultancy services?

London leads with 8904 headquartered companies, followed by Manchester (687) and Birmingham (395).

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 80,212 verified decision-maker contacts tracked across these 29,151 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 24, 2026.

Ready to reach these companies? Verified emails and direct dials for all 29,151 consultancy services based in the United Kingdom. Start with a free account, no credit card.

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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.

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