Company lists · Data refreshed September 2026

Top 25 Investigative agencies based in the United Kingdom

Name: Investigative agencies 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 183 companies tracked

RevenueBase identified 183 investigative agencies headquartered in the United Kingdom as of September 2026 and tracks 869 professional contacts across them, including 151 with verified work emails. London is the largest hub.

This list covers investigative agencies 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

183Companies

869Contacts tracked

151Verified emails

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The 25 largest investigative agencies based in the United Kingdom

Ranked by team size

Top 25 of 183 investigative agencies 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 investigative agencies: 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	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
2	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
3	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
4	Conflict International	Strong evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	21 contacts →
	Strong evidence “Conflict International is a London based private detective agency that offers private Investigation & Intelligence services across the UK, as well as in Europe and across the…” Source: RevenueBase Database · checked Sep 20, 2026
5	Tremark Associates	Strong evidence	Leeds, United KingdomHQ checked Sep 20, 2026	11-50	20 contacts →
	Strong evidence “Tremark Associates Ltd is an experienced, knowledgeable, high-quality professional investigation business that delivers a reputable, proven service to clients across the UK and…” Source: RevenueBase Database · checked Sep 20, 2026
6	Diligence	Strong evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	18 contacts →
	Strong evidence “Diligence is a private investigations firm, the output of our investigations help our clients make informed decisions bridging the gap between what they know and what they need to…” Source: RevenueBase Database · checked Sep 20, 2026
7	B3sixty	Strong evidence	Balcombe, United KingdomHQ checked Sep 20, 2026	1-10	10 contacts →
	Strong evidence “B3sixty specialises in independent workplace investigations, investigative review, dispute resolution and related training and support.” Source: RevenueBase Database · checked Sep 20, 2026
8	Quest Sports Investigations, Intelligence, Security	Strong evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	10 contacts →
	Strong evidence “Quest provides bespoke investigations, integrity and security services to corporate clients, sports organisations, and high net worth individuals.” Source: RevenueBase Database · checked Sep 20, 2026
9	Silverbridge	Strong evidence	London, United KingdomHQ checked Sep 20, 2026	1-10	9 contacts →
	Strong evidence “Silverbridge is an independent investigations and intelligence firm offering a full range of information gathering services.” Source: RevenueBase Database · checked Sep 20, 2026
10	Insightx	Strong evidence	London, United KingdomHQ checked Sep 20, 2026	1-10	8 contacts →
	Strong evidence “InsightX is a specialist independent intelligence, investigations and due diligence agency.” Source: RevenueBase Database · checked Sep 20, 2026
11	Investigation Limited	Strong evidence	Newark, United KingdomHQ checked Sep 20, 2026	11-50	8 contacts →
	Strong evidence “Investigation Limited is a well-established company offering Corporate Intelligence Services globally.” Source: RevenueBase Database · checked Sep 20, 2026
12	Intraorbis Limited	Indirect evidence	Sudbury, United KingdomHQ checked Sep 20, 2026	1-10	7 contacts →
	Indirect evidence “IntraOrbis was founded in 2004 and quickly established itself within the Brand Protection sector as an international solution provider.” Source: RevenueBase Database · checked Sep 20, 2026
13	Sirs Europe	Strong evidence	Isleworth, United KingdomHQ checked Sep 20, 2026	11-50	7 contacts →
	Strong evidence “We are a leading international investigation and discovery company with five UK offices and a network of agents worldwide.” Source: RevenueBase Database · checked Sep 20, 2026
14	Find Non-Profit	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	1-10	7 contacts →
	Indirect evidence “FIND investigates the actors, technologies, and systems that enable and profit from human rights abuses, international crimes, and environmental harm.” Source: RevenueBase Database · checked Sep 20, 2026
15	Priority International	Indirect evidence	Holywood, United KingdomHQ checked Sep 20, 2026	1-10	6 contacts →
	Indirect evidence “Priority International helps Private Investigators handle international matters as a trusted extension of their office.” Source: RevenueBase Database · checked Sep 20, 2026
16	Taylor Investigations Limited	Strong evidence	Norwich, United KingdomHQ checked Sep 20, 2026	1-10	6 contacts →
	Strong evidence “We are a Private Investigation company offering services nationwide and worldwide to both private and commercial clients.” Source: RevenueBase Database · checked Sep 20, 2026
17	PEL Consultancy Services	Strong evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	6 contacts →
	Strong evidence “PEL Consultancy Services provides discreet investigation and intelligence support for private clients, legal professionals, businesses and family offices.” Source: RevenueBase Database · checked Sep 20, 2026
18	International Intelligence Limited	Indirect evidence	Gloucester, United KingdomHQ checked Sep 20, 2026	11-50	6 contacts →
	Indirect evidence “Since incorporation in 2002, International Intelligence Limited has provided services world-wide in support of our Clients.” Source: RevenueBase Database · checked Sep 20, 2026
19	Probe IPR & Corporate Intelligence	Strong evidence	Newark, United KingdomHQ checked Sep 20, 2026	11-50	5 contacts →
	Strong evidence “Probe IPR & Corporate Intelligence is a well-established company specialising in the investigation, protection and enforcement of IP Rights and the provision of Corporate…” Source: RevenueBase Database · checked Sep 20, 2026
20	DE Vere Intellica	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	4 contacts →
	Indirect evidence “De Vere Intellica has provided a wide range of services to the Financial Services, Legal, Insolvency, Corporate and Not-for Profit sectors since the early 1990s.” Source: RevenueBase Database · checked Sep 20, 2026
21	Licence Bureau LTD & WM Investigation LTD	Strong evidence	Hemel Hempstead, United KingdomHQ checked Sep 20, 2026	11-50	4 contacts →
	Strong evidence “WM Investigation will satisfy your private or commercial investigation requirement, we have the knowledge skills experience and professionalism to respond quickly and effectively…” Source: RevenueBase Database · checked Sep 20, 2026
22	Ch&i Associates LTD	Strong evidence	Macclesfield, United KingdomHQ checked Sep 20, 2026	1-10	3 contacts →
	Strong evidence “ch & i associates offers fast, independent complaint, conduct, disciplinary & grievance investigations and reviews.” Source: RevenueBase Database · checked Sep 20, 2026
23	Crystal Vantage	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	1-10	3 contacts →
	Indirect evidence “Disputes \| Asset Tracing \| Due Diligence” Source: RevenueBase Database · checked Sep 20, 2026
24	KPEA	Strong evidence	Solihull, United KingdomHQ checked Sep 20, 2026	1-10	3 contacts →
	Strong evidence “KPEA (UK) LTD tracing agency/process serving is a security and investigations company based out of PO Box 18132.” Source: RevenueBase Database · checked Sep 20, 2026
25	Revealpi	Strong evidence	Birmingham, United KingdomHQ checked Sep 20, 2026	11-50	2 contacts →
	Strong evidence “Over many years working in the private investigations industry we have established ourselves as a key player, using skill and experience we offer our clients a discrete service…” 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: investigative agencies. 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 investigative agencies.
Partial evidence: Its own public description names part of investigative agencies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name investigative agencies. 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 183 investigative agencies based in the United Kingdom

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Investigative agencies based in the United Kingdom at a glance

As of Sep 20, 2026

17.4%Verified-email coverage

4.7Average contacts per company

1-10Median size (employees)

32.8%Largest-city concentration · London

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

127

11-50

51-200

201-500

5,001-10,000

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 183 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 investigative agencies, 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 “investigative agencies”. 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 investigative agencies), 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 investigative agencies, 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, 151 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.

Investigative agencies by metro

Investigative agencies in London60

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 investigative agencies, 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 investigative agencies are there based in the United Kingdom?

RevenueBase identified 183 investigative agencies 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?

Examworks Investigation Services, headquartered in Bolton, tops this list with the largest team on record.

Which city has the most investigative agencies?

London leads with 60 headquartered companies, followed by Manchester (5) and Edinburgh (4).

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 151 verified decision-maker contacts tracked across these 183 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.