Company lists · Data refreshed September 2026

Top 25 Impact measurement consultants based in the United Kingdom

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

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 276 companies tracked

RevenueBase identified 276 impact measurement consultants headquartered in the United Kingdom as of September 2026 and tracks 1,315 professional contacts across them, including 570 with verified work emails. London is the largest hub.

This list covers impact measurement consultants 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 20, 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 20, 2026 86% judged on-target in blind review

276Companies

1,315Contacts tracked

570Verified emails

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The 25 largest impact measurement consultants based in the United Kingdom

Ranked by team size

Top 25 of 276 impact measurement consultants based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to impact measurement 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	Eastside People	Partial evidence	London, United KingdomHQ checked Sep 20, 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 20, 2026
2	IOD Parc	Indirect evidence	Sheffield, United KingdomHQ checked Sep 20, 2026	11-50	56 contacts →
	Indirect evidence “Incorporated in 1998 in the United Kingdom, IOD PARC is a private consulting company and a leading, global specialist-provider in results-based performance assessment in…” Source: RevenueBase Database · checked Sep 20, 2026
3	GC Insight	Partial evidence	Manchester, United KingdomHQ checked Sep 20, 2026	11-50	40 contacts →
	Partial evidence “PURPOSE-DRIVEN RESEARCH & ADVICE SERVICES We are a social enterprise, committed to generating social value impacts and helping our clients have a more positive impact on place…” Source: RevenueBase Database · checked Sep 20, 2026
4	Renaisi	Strong evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	36 contacts →
	Strong evidence “We are Renaisi, a social impact consultancy helping people and places to thrive.” Source: RevenueBase Database · checked Sep 20, 2026
5	Substance	Indirect evidence	Manchester, United KingdomHQ checked Sep 20, 2026	11-50	34 contacts →
	Indirect evidence “Founded in Manchester, 2005.” Source: RevenueBase Database · checked Sep 20, 2026
6	The Good Economy Partnership Limited	Partial evidence	London, United KingdomHQ checked Sep 20, 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 20, 2026
7	180 Degrees Consulting Imperial	Partial evidence	South Kensington, United KingdomHQ checked Sep 20, 2026	11-50	31 contacts →
	Partial evidence “With more than students all over the world and branches at over 100 leading universities, 180 Degrees Consulting is the world’s largest university-based consultancy and the…” Source: RevenueBase Database · checked Sep 20, 2026
8	S3 Solutions	Partial evidence	Belfast, United KingdomHQ checked Sep 20, 2026	11-50	30 contacts →
	Partial evidence “Established in 2013, S3 Solutions is an independent consultancy company.” Source: RevenueBase Database · checked Sep 20, 2026
9	Kaleidoscope Health And Care	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	28 contacts →
	Partial evidence “Kaleidoscope is an award-winning social enterprise consultancy.” Source: RevenueBase Database · checked Sep 20, 2026
10	The Social Investment Consultancy Tsic	Partial evidence	London, United KingdomHQ checked Sep 20, 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 20, 2026
11	Mh&a	Indirect evidence	London, United KingdomHQ checked Sep 20, 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 20, 2026
12	Trust Impact	Partial evidence	London, United KingdomHQ checked Sep 20, 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 20, 2026
13	Chord Consult	Partial evidence	Nottingham, United KingdomHQ checked Sep 20, 2026	1-10	22 contacts →
	Partial evidence “Chord Consult is an M&E consultancy founded in June 2022.” Source: RevenueBase Database · checked Sep 20, 2026
14	Small World Consulting	Partial evidence	Lancaster, United KingdomHQ checked Sep 20, 2026	11-50	18 contacts →
	Partial evidence “We help organisations understand their true impact on people and planet and inspire them to think and act differently to become truly sustainable.” Source: RevenueBase Database · checked Sep 20, 2026
15	Upshot Marketing	Partial evidence	Brighton, United KingdomHQ checked Sep 20, 2026	1-10	17 contacts →
	Partial evidence “A results-driven marketing consultancy based in Brighton.” Source: RevenueBase Database · checked Sep 20, 2026
16	Impact Reporting	Indirect evidence	Manchester, United KingdomHQ checked Sep 20, 2026	11-50	16 contacts →
	Indirect evidence “Change just got real.” Source: RevenueBase Database · checked Sep 20, 2026
17	Firetail	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	16 contacts →
	Partial evidence “Firetail is a strategy consultancy working to achieve social progress.” Source: RevenueBase Database · checked Sep 20, 2026
18	The Social Innovation Partnership Tsip	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	15 contacts →
	Partial evidence “The Social Innovation Partnership (TSIP) is a trusted advisor to public, private and social sector organisations seeking to maximise their social impact.” Source: RevenueBase Database · checked Sep 20, 2026
19	Achates	Strong evidence	Streatham Hill, United KingdomHQ checked Sep 20, 2026	1-10	13 contacts →
	Strong evidence “Achates is a cultural consultancy company providing support to the cultural sector with fundraising, strategy, business planning, recruitment and impact evaluation.” Source: RevenueBase Database · checked Sep 20, 2026
20	Simetrica-Jacobs	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	12 contacts →
	Indirect evidence “Whether you’re determining how to drive additional benefits, the best option for your investment, or how to maximise savings, it is imperative to understand and articulate the…” Source: RevenueBase Database · checked Sep 20, 2026
21	Metametrics	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	1-10	12 contacts →
	Indirect evidence “Rigorous.” Source: RevenueBase Database · checked Sep 20, 2026
22	Impactloop LTD	Strong evidence	London, United KingdomHQ checked Sep 20, 2026	1-10	12 contacts →
	Strong evidence “ImpactLoop LTD is a UK-based boutique consultancy that bridges research and practice to ensure policies, programmes, and projects are grounded in evidence and contribute to…” Source: RevenueBase Database · checked Sep 20, 2026
23	HIVVE	Partial evidence	Bourne End, United KingdomHQ checked Sep 20, 2026	11-50	10 contacts →
	Partial evidence “hivve (formally Vertigo Ventures - VV) empowers organisations and individuals around the world to understand, capture and demonstrate the impact of their research.” Source: RevenueBase Database · checked Sep 20, 2026
24	Sonnet Advisory & Impact CIC	Strong evidence	London, United KingdomHQ checked Sep 20, 2026	1-10	9 contacts →
	Strong evidence “We’re a research and strategic consultancy with specialisms in mergers and acquisitions, and the design and reform of impact-based organisations and interventions Traditional…” Source: RevenueBase Database · checked Sep 20, 2026
25	Eido Research	Indirect evidence	Warlingham, United KingdomHQ checked Sep 20, 2026	1-10	8 contacts →
	Indirect evidence “Eido Research was founded by Samuel and Ben on a shared passion and a shared frustration.” Source: RevenueBase Database · checked Sep 20, 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 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 consultants.
Partial evidence: Its own public description names part of impact measurement 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 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 276 impact measurement consultants based in the United Kingdom

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Impact measurement consultants based in the United Kingdom at a glance

As of Sep 20, 2026

43.3%Verified-email coverage

4.8Average contacts per company

1-10Median size (employees)

45.7%Largest-city concentration · London

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

223

11-50

51-200

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 276 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 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 the United Kingdom whose own description of what they do matches “impact measurement 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 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 consultants, 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, 570 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 20, 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.

Impact measurement consultants by metro

Impact measurement consultants in London126

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 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 consultants are there based in the United Kingdom?

RevenueBase identified 276 impact measurement consultants 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?

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

Which city has the most impact measurement consultants?

London leads with 126 headquartered companies, followed by Manchester (11) and Bristol (6).

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 570 verified decision-maker contacts tracked across these 276 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 20, 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.