Company lists · Data refreshed September 2026

Top 25 Investigation firms based in the United Kingdom

Name: Investigation 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 20, 2026 687 companies tracked

RevenueBase identified 687 investigation firms headquartered in the United Kingdom as of September 2026 and tracks 6,969 professional contacts across them, including 2,099 with verified work emails. London is the largest hub.

This list covers investigation 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, 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

687Companies

6,969Contacts tracked

2,099Verified emails

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The 25 largest investigation firms based in the United Kingdom

Ranked by team size

Top 25 of 687 investigation firms 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 investigation 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	HKA	Strong evidence	London, United KingdomHQ checked Sep 20, 2026	1,001-5,000	1,129 contacts →
	Strong evidence “HKA is the leading global consultancy in risk mitigation, forensic investigations, dispute resolution, expert witness and litigation support services.” Source: RevenueBase Database · checked Sep 20, 2026
2	Eurofins Forensic Services	Indirect evidence	Feltham, United KingdomHQ checked Sep 20, 2026	1,001-5,000	394 contacts →
	Indirect evidence “Eurofins Forensic Services (formerly LGC Forensics) is the market leader in the provision of forensic services to the England and Wales Criminal Justice System and to criminal…” Source: RevenueBase Database · checked Sep 20, 2026
3	Colvill Banks LTD	Indirect evidence	Fareham, United KingdomHQ checked Sep 20, 2026	201-500	309 contacts →
	Indirect evidence “Colvill Banks are experts in candidate research and identification.” Source: RevenueBase Database · checked Sep 20, 2026
4	Forensic Risk Alliance	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	195 contacts →
	Indirect evidence “Forensic Risk Alliance (FRA) is an international consultancy that combines forensic accounting and forensic technology expertise to position businesses for success with…” Source: RevenueBase Database · checked Sep 20, 2026
5	Hawkins & Associates	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	184 contacts →
	Indirect evidence “Hawkins is a multi-disciplinary forensic practice established in 1980 with offices across the UK & Ireland, Europe, MEA and Asia.” Source: RevenueBase Database · checked Sep 20, 2026
6	Corporate Research And Investigations	Strong evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	140 contacts →
	Strong evidence “Corporate Research and Investigations Limited is a global provider of investigative research, background screening and business due diligence services for the world’s leading…” Source: RevenueBase Database · checked Sep 20, 2026
7	CCL Solutions Group	Strong evidence	Stratford Upon Avon, United KingdomHQ checked Sep 20, 2026	51-200	138 contacts →
	Strong evidence “CCL Solutions Group is one of Europe’s leading digital forensics, digital investigation and cyber security specialists, supporting law enforcement, government agencies, military…” Source: RevenueBase Database · checked Sep 20, 2026
8	FACT	Strong evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	117 contacts →
	Strong evidence “FACT are at the forefront of investigative and intelligence services, recognised by organisations, law enforcement, and governments worldwide.” Source: RevenueBase Database · checked Sep 20, 2026
9	Burgoynes	Strong evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	96 contacts →
	Strong evidence “Burgoynes conduct forensic scientific and engineering investigations of fires, explosions and other major accidents, and serve as expert witnesses.” Source: RevenueBase Database · checked Sep 20, 2026
10	The Risk Advisory Group	Strong evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	94 contacts →
	Strong evidence “Risk Advisory Group is a global business intelligence and investigations firm.” Source: RevenueBase Database · checked Sep 20, 2026
11	Netwatch Global	Strong evidence	Birmingham, United KingdomHQ checked Sep 20, 2026	51-200	66 contacts →
	Strong evidence “NetWatch Global® specialise in online investigations and are experts in social media and open source investigation.” Source: RevenueBase Database · checked Sep 20, 2026
12	Wallbrook, Part Of Anthesis	Strong evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	64 contacts →
	Strong evidence “We provide intelligence, advisory and investigative services to investors, companies and NGOs grappling with the world's most important issues.” Source: RevenueBase Database · checked Sep 20, 2026
13	Pallas Partners LLP	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	63 contacts →
	Indirect evidence “Focused on delivering phenomenal results, challenging traditional notions, and placing your interests at the forefront of everything that we do – Pallas leverages bold, winning…” Source: RevenueBase Database · checked Sep 20, 2026
14	Aperio Intelligence	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	58 contacts →
	Indirect evidence “Aperio Intelligence is an independent, integrity risk consultancy headquartered in the City of London.” Source: RevenueBase Database · checked Sep 20, 2026
15	Examworks Investigation Services	Strong evidence	Bolton, United KingdomHQ checked Sep 20, 2026	51-200	51 contacts →
	Strong evidence “ExamWorks Investigation Services is a leading claims investigation company providing the insurance, banking, retail and other sectors with a range of innovative and cost effective…” Source: RevenueBase Database · checked Sep 20, 2026
16	CDI	Indirect evidence	Sunderland, United KingdomHQ checked Sep 20, 2026	51-200	46 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 20, 2026
17	Intaforensics	Indirect evidence	Nuneaton, United KingdomHQ checked Sep 20, 2026	11-50	44 contacts →
	Indirect evidence “IntaForensics is a leading UK provider of Cyber Security, Digital Forensics, e-Discovery, and Cell Site Analysis services.” Source: RevenueBase Database · checked Sep 20, 2026
18	Capcon Limited	Strong evidence	Epsom, United KingdomHQ checked Sep 20, 2026	51-200	39 contacts →
	Strong evidence “Founded by Ken Dulieu, Capcon initially specialised in the provision of stocktaking and investigation services, before diversifying to include the provision of security personnel…” Source: RevenueBase Database · checked Sep 20, 2026
19	ICP	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	38 contacts →
	Indirect evidence “ICP is an independent, human-led research firm providing decision-grade intelligence on companies operating in markets where reliable data cannot be trusted.” Source: RevenueBase Database · checked Sep 20, 2026
20	HAROD	Strong evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	36 contacts →
	Strong evidence “Harod Associates delivers global investigation and security solutions to complex crime and risk issues.” Source: RevenueBase Database · checked Sep 20, 2026
21	C. Lewis & Company	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	32 contacts →
	Indirect evidence “We are an independent specialist international forensic accounting firm focused on providing services to clients in the insurance industry and for litigation support / dispute…” Source: RevenueBase Database · checked Sep 20, 2026
22	Raedas	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	31 contacts →
	Indirect evidence “Raedas was established by experienced investigators to provide specialist knowledge and a tailored approach in high-stakes international litigation and arbitration.” Source: RevenueBase Database · checked Sep 20, 2026
23	RGI	Strong evidence	Cheadle Hulme, United KingdomHQ checked Sep 20, 2026	51-200	30 contacts →
	Strong evidence “RGI Solutions - Solving the Toughest Cases with Precision and Expertise Welcome to RGI Solutions, the leading independent investigations company in the UK!” Source: RevenueBase Database · checked Sep 20, 2026
24	Forths Forensic Accountants	Indirect evidence	Leeds, United KingdomHQ checked Sep 20, 2026	11-50	26 contacts →
	Indirect evidence “Forths Forensic Accountants is one UK's leading Forensic Accountancy specialists serving the requirements of Solicitors, Insurance Companies, Private Businesses and Individuals.” Source: RevenueBase Database · checked Sep 20, 2026
25	Sastre Consulting	Strong evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	23 contacts →
	Strong evidence “Sastre is a research consultancy, a global collective of multi-lingual corporate investigations professionals and public policy analysts who specialise in modern open source…” 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: investigation 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 investigation firms.
Partial evidence: Its own public description names part of investigation firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name investigation 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 687 investigation firms based in the United Kingdom

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Investigation firms based in the United Kingdom at a glance

As of Sep 20, 2026

30.1%Verified-email coverage

10.1Average contacts per company

1-10Median size (employees)

31.0%Largest-city concentration · London

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

456

11-50

150

51-200

201-500

1,001-5,000

10001+

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 687 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 investigation 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 the United Kingdom whose own description of what they do matches “investigation 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 investigation 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 investigation 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 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, 2,099 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.

Investigation firms by metro

Investigation firms in London213

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 investigation 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 investigation firms are there based in the United Kingdom?

RevenueBase identified 687 investigation 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?

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

Which city has the most investigation firms?

London leads with 213 headquartered companies, followed by Manchester (21) and Birmingham (15).

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 2,099 verified decision-maker contacts tracked across these 687 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.