Company lists · Data refreshed September 2026

Top 24 Impact measurement consulting firms based in the United Kingdom

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

Compiled by the RevenueBase Data Team Data refreshed Sep 3, 2026 629 companies tracked

RevenueBase identified 629 impact measurement consulting firms headquartered in the United Kingdom as of September 2026 and tracks 3,473 professional contacts across them, including 1,271 with verified work emails and 290 with mobile numbers. London is the largest hub.

This list covers impact measurement consulting firms 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, how directly it supports the match, and when it was last checked. Data refreshed September 3, 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 HQ checked on every row Match evidence on every row Refreshed Sep 3, 2026 86% judged on-target in blind review

629Companies

3,473Contacts tracked

1,271Verified emails

290Mobile numbers

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The 24 largest impact measurement consulting firms based in the United Kingdom

Ranked by team size

Top 24 of 629 impact measurement consulting firms based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 3, 2026. Evidence rates how directly each company's own description names impact measurement consulting firms: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#	Company	Headquarters	Employees	Contacts
1	The Smarty TrainPartial evidence	London, United KingdomHQ checked Sep 3, 2026	11-50	84
	“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: company website · checked Sep 3, 2026
2	180 Degrees Consulting BathPartial evidence	Bath, United KingdomHQ checked Sep 3, 2026	51-200	71
	“180 Degrees Consulting is the world's largest consultancy for non-profits and social enterprises.” Source: company website · checked Sep 3, 2026
3	MontroseIndirect evidence	Jersey, United KingdomHQ checked Sep 3, 2026	51-200	70
	“Montrose is an international development consultancy and project management company providing services to bilateral and multi-lateral development agencies, non-governmental…” Source: company website · checked Sep 3, 2026
4	Eastside PeoplePartial evidence	London, United KingdomHQ checked Sep 3, 2026	51-200	59
	“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: company website · checked Sep 3, 2026
5	IOD ParcPartial evidence	Sheffield, United KingdomHQ checked Sep 3, 2026	11-50	56
	“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: company website · checked Sep 3, 2026
6	BRINKPartial evidence	London, United KingdomHQ checked Sep 3, 2026	11-50	55
	“Brink is a behavioral science and innovation consultancy focused on social impact and international development across Africa and globally.” Source: company website · checked Sep 3, 2026
7	TH NKIndirect evidence	London, United KingdomHQ checked Sep 3, 2026	n/a	42
	“You can now find us over at EPAM Continuum.” Source: company website · checked Sep 3, 2026
8	GC InsightPartial evidence	Manchester, United KingdomHQ checked Sep 3, 2026	11-50	40
	“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: company website · checked Sep 3, 2026
9	BrodiePartial evidence	London, United KingdomHQ checked Sep 3, 2026	11-50	39
	“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: company website · checked Sep 3, 2026
10	SubstanceIndirect evidence	Manchester, United KingdomHQ checked Sep 3, 2026	11-50	34
	“Founded in Manchester, 2005.” Source: company website · checked Sep 3, 2026
11	RenaisiPartial evidence	Of, United KingdomHQ checked Sep 3, 2026	11-50	32
	“We are Renaisi, a social impact consultancy helping people and places to thrive.” Source: company website · checked Sep 3, 2026
12	The Good Economy Partnership LimitedIndirect evidence	London, United KingdomHQ checked Sep 3, 2026	11-50	31
	“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: company website · checked Sep 3, 2026
13	180 Degrees Consulting ImperialPartial evidence	South Kensington, United KingdomHQ checked Sep 3, 2026	11-50	31
	“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: company website · checked Sep 3, 2026
14	Kaleidoscope Health And CareIndirect evidence	London, United KingdomHQ checked Sep 3, 2026	11-50	30
	“Kaleidoscope is an award-winning social enterprise consultancy.” Source: company website · checked Sep 3, 2026
15	Mh&aIndirect evidence	London, United KingdomHQ checked Sep 3, 2026	11-50	29
	“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: company website · checked Sep 3, 2026
16	Innovation Consulting & SolutionsIndirect evidence	Birmingham, United KingdomHQ checked Sep 3, 2026	11-50	27
	“ICS is a leading international development consultancy providing humanitarian leadership and analytics capacities combined with technology-driven solutions for the humanitarian…” Source: company website · checked Sep 3, 2026
17	Positive LuxuryIndirect evidence	London, United KingdomHQ checked Sep 3, 2026	11-50	25
	“Positive Luxury are the leading sustainability experts for the global luxury industry, offering all of the industry’s sustainability needs under one roof.” Source: company website · checked Sep 3, 2026
18	Centre For Strategy & Evaluation Services CsesIndirect evidence	London, United KingdomHQ checked Sep 3, 2026	11-50	25
	“The Centre for Strategy & Evaluation Services (CSES) was established in CSES offers multi-disciplinary research and consultancy services and specialises in the following: •…” Source: company website · checked Sep 3, 2026
19	MIMEIndirect evidence	London, United KingdomHQ checked Sep 3, 2026	11-50	23
	“Mime is expert at turning data into useful and engaging insights.” Source: company website · checked Sep 3, 2026
20	Good InnovationIndirect evidence	London, United KingdomHQ checked Sep 3, 2026	11-50	22
	“We help charities transform their income and services.” Source: company website · checked Sep 3, 2026
21	Trust ImpactPartial evidence	London, United KingdomHQ checked Sep 3, 2026	11-50	22
	“It’s never been more important for organisations to explore, align, amplify and communicate the positive impact you’re having.” Source: company website · checked Sep 3, 2026
22	Chord ConsultIndirect evidence	Nottingham, United KingdomHQ checked Sep 3, 2026	1-10	22
	“Chord Consult is an M&E consultancy founded in June 2022.” Source: company website · checked Sep 3, 2026
23	C21Indirect evidence	Altrincham, United KingdomHQ checked Sep 3, 2026	11-50	20
	“Our purpose is to create change for good.” Source: company website · checked Sep 3, 2026
24	GreenheartIndirect evidence	Uk-wide, United KingdomHQ checked Sep 3, 2026	11-50	20
	“Sustainability is not enough!” Source: company website · checked Sep 3, 2026

Showing 24 of 629 impact measurement consulting firms based in the United Kingdom

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Impact measurement consulting firms based in the United Kingdom at a glance

As of Sep 3, 2026

1-10Median size (employees)

LondonLargest hub · 305 HQs

290Contacts with mobile numbers

Sep 3, 2026Data refreshed

Companies by employee count

1-10

513

11-50

51-200

201-500

10001+

Verified emails by last verification

0–30

31–60

61–90

721

90–180

448

180+

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 consulting firms, so some rows will be adjacent to the category rather than pure plays. The description and evidence 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 SmartSearch, 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 consulting firms”. Matching reads each company's description, not its industry code or its name.
What we exclude: Companies whose own description does not clearly place them among impact measurement consulting firms, 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 an evidence 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, 1,271 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 3, 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 consulting firms by metro

Impact measurement consulting firms in London305

Frequently asked

How many impact measurement consulting firms are there based in the United Kingdom?

RevenueBase identified 629 impact measurement consulting firms 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?

The Smarty Train, headquartered in London, tops this list with the largest team on record.

Which city has the most impact measurement consulting firms?

London leads with 305 headquartered companies, followed by Bristol (15) and Manchester (14).

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 1,271 verified decision-maker contacts tracked across these 629 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 3, 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.