Company lists · Data refreshed September 2026

Top 25 Association business consulting firms based in London, United Kingdom

Name: Association business consulting firms based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 23, 2026 637 companies tracked

RevenueBase identified 637 association business consulting firms headquartered in London, United Kingdom as of September 2026 and tracks 4,254 professional contacts across them, including 1,220 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers association business consulting firms headquartered in London, 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 23, 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 23, 2026 86% judged on-target in blind review

637Companies

4,254Contacts tracked

1,220Verified emails

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The 25 largest association business consulting firms based in London, United Kingdom

Ranked by team size

Top 25 of 637 association business consulting firms based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 23, 2026. RevenueBase Smart Search rates how each company's information relates to association business consulting firms: 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	Quantuma	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	201-500	277 contacts →
	Indirect evidence “Quantuma is a leading business advisory firm which works with businesses at the key milestones.” Source: RevenueBase Database · checked Sep 23, 2026
2	Elixirr	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	501-1,000	275 contacts →
	Partial evidence “An award-winning global consulting firm working with clients across a diverse range of markets, industries and geographies.” Source: RevenueBase Database · checked Sep 23, 2026
3	Oury Clark	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	51-200	171 contacts →
	Indirect evidence “Our pioneering integrated approach to professional services cuts through the complicated layers of the legal and accountancy world to give you straightforward joined-up advice and…” Source: RevenueBase Database · checked Sep 23, 2026
4	Camelot	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	51-200	66 contacts →
	Indirect evidence “We are a network of independent consultants who are ex-C-Suite Execs/Senior Managers who have all been there and done it in top organisations, mainly in insurance but others as…” Source: RevenueBase Database · checked Sep 23, 2026
5	GCE	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	51-200	57 contacts →
	Indirect evidence “Are you looking to maximize your business relationships across the globe?” Source: RevenueBase Database · checked Sep 23, 2026
6	Management Consultancies Association	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	11-50	52 contacts →
	Partial evidence “The Management Consultancies Association (MCA) is the representative body for management consultancy firms in the UK.” Source: RevenueBase Database · checked Sep 23, 2026
7	Managing Partners' Forum	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	n/a	50 contacts →
	Indirect evidence “Managing Partners' Forum is a membership organisation dedicated to helping professional firms grow by providing insights to improve performance, increase profitability and prepare…” Source: RevenueBase Database · checked Sep 23, 2026
8	Q4accounting	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	11-50	43 contacts →
	Indirect evidence “Q4 Accounting is a powerful network of efficient and eminent accounting professionals.” Source: RevenueBase Database · checked Sep 23, 2026
9	Kindleworth LLP	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	11-50	40 contacts →
	Indirect evidence “Kindleworth has launched and managed some of the boldest and most successful new law firms of the last decade, in the UK and across the globe.” Source: RevenueBase Database · checked Sep 23, 2026
10	Future Factory	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	51-200	40 contacts →
	Indirect evidence “We’re Future Factory and we’re pretty damn proud to be one of the UK’s leading business development consultancies.” Source: RevenueBase Database · checked Sep 23, 2026
11	Regency Grove Consultants	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	11-50	38 contacts →
	Indirect evidence “At Regency Grove we pride ourselves on providing each client with an exceptional standard of service to suit their specific needs and requirements.” Source: RevenueBase Database · checked Sep 23, 2026
12	Integra International LTD	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	1,001-5,000	38 contacts →
	Indirect evidence “Integra International® is a global alliance of independent CPAs, CAs, Legal and Business Advisory firms that drive smart growth of their businesses by sharing knowledge and…” Source: RevenueBase Database · checked Sep 23, 2026
13	Zentso	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	11-50	34 contacts →
	Partial evidence “At Zentso, we specialise in helping membership organisations, associations, and unions get the most from their CRM.” Source: RevenueBase Database · checked Sep 23, 2026
14	Dragon Argent	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	11-50	32 contacts →
	Indirect evidence “Dragon Argent believes that with expert and entrepreneurial professional advice, every business can realise its potential.” Source: RevenueBase Database · checked Sep 23, 2026
15	Iapa International	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	1-10	30 contacts →
	Partial evidence “IAPA is a global association of independent accountancy, legal and business advisory firms who provide accounting, audit, tax advisory, legal and business consultancy services.” Source: RevenueBase Database · checked Sep 23, 2026
16	WTS Hansuke	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	11-50	27 contacts →
	Indirect evidence “WTS Hansuke is a specialist professional services firm notable for its focus on excellent client service and agility.” Source: RevenueBase Database · checked Sep 23, 2026
17	JTN Group	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	11-50	27 contacts →
	Indirect evidence “JTN stands for growth in all its forms: Revenue Growth; Margin Growth; and Personal Growth.” Source: RevenueBase Database · checked Sep 23, 2026
18	KBM Group	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	51-200	26 contacts →
	Partial evidence “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…” Source: RevenueBase Database · checked Sep 23, 2026
19	MSI Global Alliance Lawyers & Accountants	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	n/a	25 contacts →
	Partial evidence “MSI Global Alliance is one of the world’s leading international associations of independent legal and accounting firms with over 250 member firms in more than 100 countries across…” Source: RevenueBase Database · checked Sep 23, 2026
20	Pathlight Associates	Partial evidence	London, United KingdomHQ checked Sep 23, 2026	11-50	22 contacts →
	Partial evidence “What we do We are a specialist professional services firm providing consulting and assurance services, particularly to the Financial Services sector.” Source: RevenueBase Database · checked Sep 23, 2026
21	Remote Professionals	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	51-200	20 contacts →
	Indirect evidence “Our mission is to reduce the compliance accounting burden for local firms so they can focus on spending more time with clients and growing their firm Accounting firms need to be…” Source: RevenueBase Database · checked Sep 23, 2026
22	Z Group	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	11-50	18 contacts →
	Indirect evidence “We solve complex problems from starting up to exit providing robust, tax compliant and cost-effective solutions that adapt and scale, always tailored to your needs.” Source: RevenueBase Database · checked Sep 23, 2026
23	Queensbury Legal Services, Project Management & Business Advisory Support	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	11-50	16 contacts →
	Indirect evidence “A multi-disciplinary practice providing expert advisory support to all types, and size, of businesses, entrepreneurs and individuals.” Source: RevenueBase Database · checked Sep 23, 2026
24	Meridian West	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	11-50	15 contacts →
	Indirect evidence “Meridian West helps professional firms to develop and implement client-focused strategies.” Source: RevenueBase Database · checked Sep 23, 2026
25	Business Clan	Indirect evidence	London, United KingdomHQ checked Sep 23, 2026	11-50	14 contacts →
	Indirect evidence “We partner with businesses when they don't have the time or resources to do everything themselves.” Source: RevenueBase Database · checked Sep 23, 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: association business consulting firms. 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 association business consulting firms.
Partial evidence: Its own public description names part of association business consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name association business consulting firms. 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 637 association business consulting firms based in London, United Kingdom

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Association business consulting firms based in London, United Kingdom at a glance

As of Sep 23, 2026

28.7%Verified-email coverage

6.7Average contacts per company

1-10Median size (employees)

Sep 23, 2026Page data refreshed

Companies by employee count

1-10

460

11-50

126

51-200

201-500

501-1,000

1,001-5,000

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 637 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 association business consulting firms, 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 London, United Kingdom whose own description of what they do matches “association business consulting firms”. 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 association business consulting firms), 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 association business consulting firms, and records with no verified work email. Companies headquartered outside London 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, 1,220 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 23, 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.

Association business consulting firms by metro in the United Kingdom

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 association business consulting firms, 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 association business consulting firms are there based in London, United Kingdom?

RevenueBase identified 637 association business consulting firms headquartered in London, 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?

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

Which city in the United Kingdom has the most association business consulting firms?

London leads the United Kingdom with 637 headquartered companies, followed by Manchester (44) and Birmingham (26).

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 1,220 verified decision-maker contacts tracked across these 637 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 23, 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.