Company lists · Data refreshed September 2026

Top 25 Impact measurement and management consultants based in London, United Kingdom

Name: Impact measurement and management consultants based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 390 companies tracked

RevenueBase identified 390 impact measurement and management consultants headquartered in London, United Kingdom as of September 2026 and tracks 2,353 professional contacts across them, including 973 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers impact measurement and management consultants 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 28, 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 28, 2026 86% judged on-target in blind review

390Companies

2,353Contacts tracked

973Verified emails

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The 25 largest impact measurement and management consultants based in London, United Kingdom

Ranked by team size

Top 25 of 390 impact measurement and management consultants based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to impact measurement and management consultants: 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	Integrity	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	158 contacts →
	Indirect evidence “Integrity sets the international standard for ethically delivered, expert services.” Source: RevenueBase Database · checked Sep 28, 2026
2	Stellarmann	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	87 contacts →
	Indirect evidence “Complex transformation, expertly navigated.” Source: RevenueBase Database · checked Sep 28, 2026
3	The Smarty Train	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	86 contacts →
	Partial evidence “From employability and strategy formulation through to training programme design and delivery, we have been the engine behind award-winning and high-impact workplace initiatives…” Source: RevenueBase Database · checked Sep 28, 2026
4	Thirdway Partners	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	68 contacts →
	Partial evidence “ThirdWay Partners operates as an impact investment and advisory firm focused on creating inclusive sustainable development and impact.” Source: RevenueBase Database · checked Sep 28, 2026
5	Curzon Consulting	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	59 contacts →
	Strong evidence “An award-winning management consultancy who deliver tangible and enduring results for our clients.” Source: RevenueBase Database · checked Sep 28, 2026
6	Eastside People	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	58 contacts →
	Partial evidence “Eastside People is a community of experienced professionals focused on helping charity, not-for-profit and social enterprise leaders to build the capacity and impact of their…” Source: RevenueBase Database · checked Sep 28, 2026
7	Bridges Outcomes Partnerships	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	48 contacts →
	Indirect evidence “Bridges Outcomes Partnerships is a not-for-profit social enterprise.” Source: RevenueBase Database · checked Sep 28, 2026
8	Circle Development	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	45 contacts →
	Indirect evidence “Circle are Carbon, Project, Cost and Quality experts.” Source: RevenueBase Database · checked Sep 28, 2026
9	TH NK	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	n/a	41 contacts →
	Indirect evidence “You can now find us over at EPAM Continuum.” Source: RevenueBase Database · checked Sep 28, 2026
10	Brodie	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	39 contacts →
	Partial evidence “We are here to drive three significant changes: CHANGE CORPORATE IMPACT: help business to reframe and re-orient its role in society CHANGE CONSUMPTION: help brands re-wire for the…” Source: RevenueBase Database · checked Sep 28, 2026
11	The Good Economy Partnership Limited	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	31 contacts →
	Partial evidence “From consultancy to collaborative field-building, The Good Economy (TGE) is a recognised thought leader and the ‘go to’ firm for organisations looking to deliver and report on…” Source: RevenueBase Database · checked Sep 28, 2026
12	Kaleidoscope Health And Care	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	28 contacts →
	Partial evidence “Kaleidoscope is an award-winning social enterprise consultancy.” Source: RevenueBase Database · checked Sep 28, 2026
13	Singlify	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	28 contacts →
	Partial evidence “Singlify is a new social enterprise born out of the belief that technology will play a critical role in increasing the impact of social sector organisations on society.” Source: RevenueBase Database · checked Sep 28, 2026
14	Scriptoria Sustainable Development Solutions	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	27 contacts →
	Partial evidence “Scriptoria is an award-winning sustainable development consultancy delivering effective solutions for international development and research programmes through four core teams…” Source: RevenueBase Database · checked Sep 28, 2026
15	SB CO	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	27 contacts →
	Partial evidence “SB+CO is a sustainability consultancy that advises companies on strategy, sustainability activation and integration, ESG, stakeholder engagement and communications – and…” Source: RevenueBase Database · checked Sep 28, 2026
16	The Social Investment Consultancy Tsic	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	27 contacts →
	Partial evidence “The Social Investment Consultancy (TSIC) is a global organisation with a network of experts committed to creating social change.” Source: RevenueBase Database · checked Sep 28, 2026
17	Mh&a	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	27 contacts →
	Indirect evidence “MH & A was founded in 2018 by Professor Matt Hamnett, who has worked at senior levels in central Government, corporate and social sector organisations.” Source: RevenueBase Database · checked Sep 28, 2026
18	Positive Luxury	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	25 contacts →
	Indirect evidence “Positive Luxury are the sustainability experts and growth partners for the luxury industry, working with global brands to turn sustainability into a competitive advantage.” Source: RevenueBase Database · checked Sep 28, 2026
19	Carlton	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	25 contacts →
	Strong evidence “CARLTON is a differentiated, client-focused, management consultancy providing professional services to help clients enhance their business performance and shareholder value.” Source: RevenueBase Database · checked Sep 28, 2026
20	Carbonquota	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	24 contacts →
	Partial evidence “We are trusted experts in carbon measurement and reduction, specialising in packaging and print manufacturing, media and logistics sectors.” Source: RevenueBase Database · checked Sep 28, 2026
21	Trust Impact	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	22 contacts →
	Partial evidence “It’s never been more important for organisations to explore, align, amplify and communicate the positive impact you’re having.” Source: RevenueBase Database · checked Sep 28, 2026
22	Cause4	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	20 contacts →
	Indirect evidence “Cause4 is a social business founded to support charities to achieve more and become better.” Source: RevenueBase Database · checked Sep 28, 2026
23	KOREO	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	18 contacts →
	Partial evidence “We’re a purpose-driven consultancy that transforms how people lead, learn, collaborate and operate- strengthening their capacity to build a more just and regenerative world.” Source: RevenueBase Database · checked Sep 28, 2026
24	Constance	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	17 contacts →
	Partial evidence “Creative business solutions to power positive social impact.” Source: RevenueBase Database · checked Sep 28, 2026
25	Firetail	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	16 contacts →
	Partial evidence “Firetail is a strategy consultancy working to achieve social progress.” Source: RevenueBase Database · checked Sep 28, 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: impact measurement and management consultants. 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 impact measurement and management consultants.
Partial evidence: Its own public description names part of impact measurement and management consultants, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name impact measurement and management consultants. 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 390 impact measurement and management consultants based in London, United Kingdom

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Impact measurement and management consultants based in London, United Kingdom at a glance

As of Sep 28, 2026

41.4%Verified-email coverage

6.0Average contacts per company

1-10Median size (employees)

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

281

11-50

51-200

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 390 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 impact measurement and management consultants, 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 “impact measurement and management consultants”. 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 impact measurement and management consultants), 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 impact measurement and management consultants, 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, 973 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 28, 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.

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 impact measurement and management consultants, 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 impact measurement and management consultants are there based in London, United Kingdom?

RevenueBase identified 390 impact measurement and management consultants 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?

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

Which city in the United Kingdom has the most impact measurement and management consultants?

London leads the United Kingdom with 390 headquartered companies, followed by Bristol (22) and Manchester (20).

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 973 verified decision-maker contacts tracked across these 390 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 28, 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.