Company lists · Data refreshed September 2026

Top 25 Consultancy services based in London, United Kingdom

Name: Consultancy services based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 24, 2026 8,904 companies tracked

RevenueBase identified 8,904 company matches for consultancy services associated with London, United Kingdom as of September 2026 and tracks 94,797 professional contacts across them, including 39,047 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers company matches for consultancy services associated with London, 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 24, 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.

How to read this list RevenueBase SmartSearch · Exact Recorded Sep 24, 2026 How this list was built

8,904Companies

94,797Contacts tracked

39,047Verified emails

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The 25 largest consultancy services based in London, United Kingdom

Ranked by team size

Top 25 of 8,904 company matches for consultancy services based in London, United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 24, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Ey-Parthenon	Exact match	London, United KingdomHQ recorded Sep 24, 2026	10001+	17,070 contacts →
	Exact match “Our unique combination of transformative strategy, transactions and corporate finance delivers real-world value – solutions that work in practice, not just on paper.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
2	MACE	Exact match	London, United KingdomHQ recorded Sep 24, 2026	5,001-10,000	8,458 contacts →
	Exact match “Mace Consult launched as a new and independent business on 5 March 2026, through a carve-out from Mace Group.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
3	Baringa	Exact match	London, United KingdomHQ recorded Sep 24, 2026	1,001-5,000	2,179 contacts →
	Exact match “Baringa is a global consulting firm that helps leaders drive meaningful change and create value.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
4	Barnett Waddingham	Exact match	London, United KingdomHQ recorded Sep 24, 2026	1,001-5,000	1,331 contacts →
	Exact match “We are a leading UK professional services consultancy at the forefront of risk, pensions, investment and insurance.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
5	Blackmont Consulting	Exact match	London, United KingdomHQ recorded Sep 24, 2026	201-500	1,221 contacts →
	Exact match “Blackmont Consulting provides 100% free advisory services to NGO´s, NPO´s and start-ups.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
6	Hoare LEA	Exact match	London, United KingdomHQ recorded Sep 24, 2026	501-1,000	1,103 contacts →
	Exact match “We are an award-winning engineering consultancy with a creative team of engineers, designers, and technical specialists.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
7	Lambert Smith Hampton	Exact match	London, United KingdomHQ recorded Sep 24, 2026	1,001-5,000	1,016 contacts →
	Exact match “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.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
8	Oc&c Strategy Consultants	Exact match	London, United KingdomHQ recorded Sep 24, 2026	501-1,000	1,011 contacts →
	Exact match “At OC & C Strategy Consultants we have more than 35 years of experience at unpicking the most complex business challenges with simple, uncommon sense™.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
9	PKF Littlejohn	Exact match	London, United KingdomHQ recorded Sep 24, 2026	501-1,000	702 contacts →
	Exact match “We are a fast-growing firm of accountants and business advisers based in London’s Canary Wharf, Leeds and in Manchester.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
10	SDSD	Exact match	London, United KingdomHQ recorded Sep 24, 2026	n/a	681 contacts →
	Exact match “SDSD - Supporting Maritime Professionals since 1983 Software innovation to the Maritime industry for more than 30 years.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
11	Waterman Group	Exact match	London, United KingdomHQ recorded Sep 24, 2026	1,001-5,000	563 contacts →
	Exact match “Waterman Group is a multidisciplinary consultancy providing sustainable solutions to meet the planning, engineering design and project delivery needs of the property…” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
12	Alten LTD - UK	Exact match	London, United KingdomHQ recorded Sep 24, 2026	10001+	529 contacts →
	Exact match “We are a leading Engineering and IT consultancy operating across all sectors in 30 different countries.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
13	Strategy Insights	Exact match	London, United KingdomHQ recorded Sep 24, 2026	51-200	528 contacts →
	Exact match “Strategy Insights is a specialist business and economic development consultancy.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
14	STEER	Exact match	London, United KingdomHQ recorded Sep 24, 2026	201-500	524 contacts →
	Exact match “Complex challenges.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
15	Broadstone	Exact match	London, United KingdomHQ recorded Sep 24, 2026	501-1,000	497 contacts →
	Exact match “Broadstone is a leading, independent UK consultancy delivering expert advice to employers, insurers, pension scheme trustees and lenders.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
16	Aspens Services LTD	Exact match	London, United KingdomHQ recorded Sep 24, 2026	5,001-10,000	497 contacts →
	Exact match “We are a catering company who specialise in the education sector.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
17	Hollis	Exact match	London, United KingdomHQ recorded Sep 24, 2026	201-500	461 contacts →
	Exact match “All together different - We’re independent, multi-disciplinary real estate technical experts, project managers, and sustainability consultants.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
18	Analysys Mason	Exact match	London, United KingdomHQ recorded Sep 24, 2026	201-500	459 contacts →
	Exact match “Analysys Mason is the leading specialist consultancy, creating lasting value in technology-intensive industries, including telecoms, digital infrastructure, software, IT services…” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
19	CPC Project Services	Exact match	London, United KingdomHQ recorded Sep 24, 2026	201-500	342 contacts →
	Exact match “CPC is an award-winning project management, cost management and building surveying consultancy.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
20	Ubique Systems	Exact match	London, United KingdomHQ recorded Sep 24, 2026	501-1,000	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 24, 2026 · View company records in RevenueBase
21	Cumming Group UK & Europe	Exact match	London, United KingdomHQ recorded Sep 24, 2026	501-1,000	324 contacts →
	Exact match “At Cumming Group, we are passionate about helping our clients execute large-scale, complex projects on-time and within budget.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
22	Cartesian	Exact match	London, United KingdomHQ recorded Sep 24, 2026	201-500	302 contacts →
	Exact match “Cartesian is a specialist consulting firm focused on the global telecommunications, media, and technology industries and is now part of Bounteous, an AI services firm helping…” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
23	Elixirr	Exact match	London, United KingdomHQ recorded Sep 24, 2026	501-1,000	275 contacts →
	Exact match “An award-winning global consulting firm working with clients across a diverse range of markets, industries and geographies.” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
24	Ingleton Wood	Exact match	London, United KingdomHQ recorded Sep 24, 2026	201-500	271 contacts →
	Exact match “We provide single, multiple and full multidisciplinary services across a wide range of industry sectors, including commercial, health, education, residential, defence, heritage…” Recorded in the RevenueBase company graph · Sep 24, 2026 · View company records in RevenueBase
25	Moorhouse B Corp Certified	Exact match	London, United KingdomHQ recorded Sep 24, 2026	201-500	247 contacts →
	Exact match “We’re a dynamic consulting firm, focused on delivering change.” Recorded in the RevenueBase company graph · Sep 24, 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 “consultancy services”. 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 8,904 consultancy services based in London, United Kingdom

See the full list, filter by size, metro and specialty, and access 39,047 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Consultancy services based in London, United Kingdom at a glance

As of Sep 24, 2026

41.2%Verified-email coverage

10.6Average contacts per company

1-10Median size (employees)

Sep 24, 2026Page data refreshed

Companies by employee count

1-10

6,850

11-50

1,569

51-200

340

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured across the whole United Kingdom list rather than for London, so it is reported there. Company counts and contact totals on this page are exact for London, over 8,904 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 London, United Kingdom whose business descriptions match “consultancy services” 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 39,047 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 24, 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.

Consultancy services by metro in the United Kingdom

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 “consultancy services”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many consultancy services are there based in London, United Kingdom?

RevenueBase identified 8,904 company matches for consultancy services associated with London, 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?

Ey-Parthenon tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city in the United Kingdom has the most consultancy services?

London leads the United Kingdom with 8,904 company records, 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 limited free results with 500 credits to start. Upgrading provides access to the 39,047 professional contacts with verified work emails tracked across these 8,904 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 24, 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 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.