Company lists · Data refreshed September 2026

Top 25 Change impact assessment companies based in the United Kingdom

Name: Change impact assessment companies based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 98 companies tracked

RevenueBase identified 98 change impact assessment companies headquartered in the United Kingdom as of September 2026 and tracks 505 professional contacts across them, including 206 with verified work emails. London is the largest hub.

This list covers change impact assessment companies 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 19, 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 19, 2026 86% judged on-target in blind review

98Companies

505Contacts tracked

206Verified emails

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The 25 largest change impact assessment companies based in the United Kingdom

Ranked by team size

Top 25 of 98 change impact assessment companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to change impact assessment companies: 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	Aether	Partial evidence	Oxford, United KingdomHQ checked Sep 19, 2026	11-50	45 contacts →
	Partial evidence “Aether provides consultancy in air quality and climate change emissions inventories, forecasting and policy analysis.” Source: RevenueBase Database · checked Sep 19, 2026
2	Partners In Change Consulting Limited	Partial evidence	Manchester, United KingdomHQ checked Sep 19, 2026	11-50	38 contacts →
	Partial evidence “Partners in Change Consulting is here to help you and your organisation get change done.” Source: RevenueBase Database · checked Sep 19, 2026
3	Geosmart Information	Indirect evidence	Shrewsbury, United KingdomHQ checked Sep 19, 2026	11-50	23 contacts →
	Indirect evidence “Our environmental information supports early intervention and is the foundation for successful and sustainable development.” Source: RevenueBase Database · checked Sep 19, 2026
4	Work Psychology Group	Indirect evidence	Derby, United KingdomHQ checked Sep 19, 2026	11-50	19 contacts →
	Indirect evidence “Founded in 2007 by Professor Fiona Patterson and Dr Maire Kerrin – both leading figures in the field of Organisational Psychology - Work Psychology Group's (WPG) customised…” Source: RevenueBase Database · checked Sep 19, 2026
5	Change Associates	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	18 contacts →
	Partial evidence “Change Associates is an Organisational Change consultancy.” Source: RevenueBase Database · checked Sep 19, 2026
6	Small World Consulting	Partial evidence	Lancaster, United KingdomHQ checked Sep 19, 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 19, 2026
7	Impact Reporting	Partial evidence	Manchester, United KingdomHQ checked Sep 19, 2026	11-50	16 contacts →
	Partial evidence “Change just got real.” Source: RevenueBase Database · checked Sep 19, 2026
8	Atlantic58 LTD	Strong evidence	Stornoway, United KingdomHQ checked Sep 19, 2026	1-10	10 contacts →
	Strong evidence “Services include: Environmental Impact Assessment, Ecological Surveys, Licensing and Regulation, Global Information Services and Mapping, Environmental / Ecological Clerk of…” Source: RevenueBase Database · checked Sep 19, 2026
9	ACP Environmental Consultants	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	10 contacts →
	Indirect evidence “ACP Environmental Consultants provides a wide range of expert environmental services across Greater London, surrounding counties, and up to the Midlands.” Source: RevenueBase Database · checked Sep 19, 2026
10	Lepus Consulting	Partial evidence	Cheltenham, United KingdomHQ checked Sep 19, 2026	1-10	9 contacts →
	Partial evidence “Lepus Consulting is a specialist environmental assessment practice.” Source: RevenueBase Database · checked Sep 19, 2026
11	Sustain Able	Indirect evidence	Bath, United KingdomHQ checked Sep 19, 2026	1-10	8 contacts →
	Indirect evidence “sustain:able is an independent advisory firm specialising in risk-based sustainability analysis for organisations operating in regulated, capital-intensive industries.” Source: RevenueBase Database · checked Sep 19, 2026
12	Ergo Strategy Group	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	8 contacts →
	Indirect evidence “Ergo Strategy Group is a global consulting firm that designs and delivers solutions at the intersection of natural resources and economic development.” Source: RevenueBase Database · checked Sep 19, 2026
13	Marfisheco Fisheries Consultants LTD	Partial evidence	Edinburgh, United KingdomHQ checked Sep 19, 2026	1-10	7 contacts →
	Partial evidence “At MarFishEco we pride ourselves on being able to help clients better understand the business impacts of their current activities based on clearly, pre-defined criteria.” Source: RevenueBase Database · checked Sep 19, 2026
14	Vested Impact	Strong evidence	London, United KingdomHQ checked Sep 19, 2026	1-10	7 contacts →
	Strong evidence “Vested Impact provides rapid, objective environmental and social risk and impact assessments across private assets, giving capital allocators consistent, auditable evidence at the…” Source: RevenueBase Database · checked Sep 19, 2026
15	Metrica Environmental Consulting LTD	Indirect evidence	York, United KingdomHQ checked Sep 19, 2026	1-10	6 contacts →
	Indirect evidence “Metrica Environmental Consulting Ltd is a leading independent environmental consultancy.” Source: RevenueBase Database · checked Sep 19, 2026
16	Accon UK Limited	Indirect evidence	Reading, United KingdomHQ checked Sep 19, 2026	1-10	6 contacts →
	Indirect evidence “We are one of the UK’s leading environmental consultancies, working within the fields of air quality, noise, vibration, lighting, flood risk, contaminated land and Environmental…” Source: RevenueBase Database · checked Sep 19, 2026
17	Babbity Environmental LTD	Indirect evidence	Glasgow, United KingdomHQ checked Sep 19, 2026	1-10	5 contacts →
	Indirect evidence “Babbity Environmental is a boutique environmental consultancy composed of experienced environmental specialists, supported by an extensive network of seasoned and experienced…” Source: RevenueBase Database · checked Sep 19, 2026
18	Carbon-Zero	Indirect evidence	Aberdeen, United KingdomHQ checked Sep 19, 2026	11-50	5 contacts →
	Indirect evidence “Carbon-Zero are an experienced energy and carbon emissions consultancy, with assessors across the UK, who support clients both internationally and across the UK in improving their…” Source: RevenueBase Database · checked Sep 19, 2026
19	Natural Capital Associates	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	1-10	4 contacts →
	Partial evidence “Natural Capital Associates is a project developer, operating partner and capital formation platform for early-stage projects with positive impact.” Source: RevenueBase Database · checked Sep 19, 2026
20	Ever Sustainable	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	1-10	4 contacts →
	Partial evidence “Ever Sustainable is an impact consultancy that helps lead businesses into a sustainable future.” Source: RevenueBase Database · checked Sep 19, 2026
21	Mcgrath Group Of Companies	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	4 contacts →
	Indirect evidence “For nearly a third of a century McGrath has been in the wisdom business.” Source: RevenueBase Database · checked Sep 19, 2026
22	The PES LTD	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	1-10	4 contacts →
	Indirect evidence “PES offers a complete range of sustainability and consultancy services to the property and development industry to meet green planning and regulatory requirements.” Source: RevenueBase Database · checked Sep 19, 2026
23	Hightail Group	Indirect evidence	United KingdomHQ checked Sep 19, 2026	1-10	3 contacts →
	Indirect evidence “On a mission to equip businesses to successfully deliver against their strategic priorities, by designing tailored programmes that measure and optimise ROI, while ensuring the…” Source: RevenueBase Database · checked Sep 19, 2026
24	Forward	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	1-10	3 contacts →
	Partial evidence “forward>> was founded by experienced sustainability professionals to help businesses maximise their positive impacts and minimise their negative impacts.” Source: RevenueBase Database · checked Sep 19, 2026
25	Twelve	Partial evidence	London & Bristol, United KingdomHQ checked Sep 19, 2026	1-10	2 contacts →
	Partial evidence “Twelve is a climate impact agency.” Source: RevenueBase Database · checked Sep 19, 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: change impact assessment companies. 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 change impact assessment companies.
Partial evidence: Its own public description names part of change impact assessment companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name change impact assessment companies. 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 98 change impact assessment companies based in the United Kingdom

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Change impact assessment companies based in the United Kingdom at a glance

As of Sep 19, 2026

40.8%Verified-email coverage

5.2Average contacts per company

1-10Median size (employees)

41.8%Largest-city concentration · London

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

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 98 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 change impact assessment companies, 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 “change impact assessment companies”. 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 change impact assessment companies), 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 change impact assessment companies, 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, 206 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 19, 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.

Change impact assessment companies by metro

Change impact assessment companies in London41

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 change impact assessment companies, 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 change impact assessment companies are there based in the United Kingdom?

RevenueBase identified 98 change impact assessment companies 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?

Aether, headquartered in Oxford, tops this list with the largest team on record.

Which city has the most change impact assessment companies?

London leads with 41 headquartered companies, followed by Bristol (3) and Manchester (3).

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 206 verified decision-maker contacts tracked across these 98 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 19, 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.