Company lists · Data refreshed September 2026

Top 25 Clearance recruitment firms based in the United Kingdom

RevenueBase identified 283 clearance recruitment firms headquartered in the United Kingdom as of September 2026 and tracks 2,470 professional contacts across them, including 825 with verified work emails. London is the largest hub.

This list covers clearance recruitment 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 27, 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 27, 2026 86% judged on-target in blind review
283Companies
2,470Contacts tracked
825Verified emails
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The 25 largest clearance recruitment firms based in the United Kingdom

Ranked by team size
Top 25 of 283 clearance recruitment firms based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 27, 2026. RevenueBase Smart Search rates how each company's information relates to clearance recruitment 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.
#CompanyRevenueBase Smart SearchHeadquartersEmployeesContacts
1Indirect evidenceLondon, United KingdomHQ checked Sep 27, 2026201-500369 contacts →

Indirect evidence

“Vivid Resourcing, a leading international talent solutions partner, connects you with in-demand technical professionals you need to flourish in the Tech, Engineering, Life…”

Source: RevenueBase Database · checked Sep 27, 2026
2Indirect evidenceBillericay, United KingdomHQ checked Sep 27, 2026201-500244 contacts →

Indirect evidence

“Tangent International Integrated Talent and Delivery across Technology and Communications.”

Source: RevenueBase Database · checked Sep 27, 2026
3Partial evidenceBromley, United KingdomHQ checked Sep 27, 2026n/a91 contacts →

Partial evidence

“SecurityClearedJobs.com is a UK based job board designed for individuals working across all industry sectors who have obtained Security Clearance or who meet the criteria for…”

Source: RevenueBase Database · checked Sep 27, 2026
4Partial evidenceCrawley, United KingdomHQ checked Sep 27, 202651-20085 contacts →

Partial evidence

“Optime is a leading force in specialised recruitment, partnering with key players across the aviation, hospitality, rail, security, and warehousing & logistics sectors.”

Source: RevenueBase Database · checked Sep 27, 2026
5Indirect evidenceBristol, United KingdomHQ checked Sep 27, 202651-20075 contacts →

Indirect evidence

“SQEP provides security-cleared experts across defence, aerospace and critical infrastructure.”

Source: RevenueBase Database · checked Sep 27, 2026
6Partial evidenceThatcham, United KingdomHQ checked Sep 27, 202611-5056 contacts →

Partial evidence

“Exceeding expectations from the very beginning At M4 Recruitment, our mission statement is “Beyond Expectation”.”

Source: RevenueBase Database · checked Sep 27, 2026
7Indirect evidenceGuildford, United KingdomHQ checked Sep 27, 202611-5049 contacts →

Indirect evidence

“Damia Group is a trusted talent solutions partner with over 30 years of experience supporting security-cleared environments, including defence, government, space, and aerospace.”

Source: RevenueBase Database · checked Sep 27, 2026
8Indirect evidenceBristol, United KingdomHQ checked Sep 27, 202651-20047 contacts →

Indirect evidence

“Sanderson Government & Defence was established over 20 years ago as a bespoke solution to a unique talent problem: sourcing and placing high-calibre professional talent to work…”

Source: RevenueBase Database · checked Sep 27, 2026
9Indirect evidenceCaerphilly, United KingdomHQ checked Sep 27, 202611-5046 contacts →

Indirect evidence

“We empower businesses by solving one of their biggest challenges: finding the right people.”

Source: RevenueBase Database · checked Sep 27, 2026
10Partial evidenceAshford, United KingdomHQ checked Sep 27, 202611-5040 contacts →

Partial evidence

“First Choice Staff is a leading UK-based recruitment agency with a 30-year pedigree and network of local branches connecting the best candidates with the best employers offering…”

Source: RevenueBase Database · checked Sep 27, 2026
11Partial evidenceSlough, United KingdomHQ checked Sep 27, 202611-5039 contacts →

Partial evidence

“Aviation Recruitment Network has been a trusted partner to the UK’s commercial aviation industry since As one of the largest providers of recruitment and vetting services in the…”

Source: RevenueBase Database · checked Sep 27, 2026
12Indirect evidenceLiverpool, United KingdomHQ checked Sep 27, 202611-5038 contacts →

Indirect evidence

“Recruiting”

Source: RevenueBase Database · checked Sep 27, 2026
13Partial evidenceLove Lane Industrial Estate, United KingdomHQ checked Sep 27, 202611-5031 contacts →

Partial evidence

“As a trusted recruitment partner we aim to identify the very best ex-military and defence sector talent that is on the market.”

Source: RevenueBase Database · checked Sep 27, 2026
14Partial evidenceBromley, United KingdomHQ checked Sep 27, 202611-5030 contacts →

Partial evidence

“Join Triumph Consultants: A Leading Partner in Public Sector Recruitment Since Triumph Consultants Limited has grown from a specialist in local government services to a top…”

Source: RevenueBase Database · checked Sep 27, 2026
15Indirect evidenceBournemouth Airport, United KingdomHQ checked Sep 27, 202611-5030 contacts →

Indirect evidence

“Luneus supports Defense & Space companies in the U.S.”

Source: RevenueBase Database · checked Sep 27, 2026
16Partial evidenceMaidenhead, United KingdomHQ checked Sep 27, 20261-1030 contacts →

Partial evidence

“As one of the oldest and established recruitment partners in this sector, we have a reputation 2nd to none in identifying the very best ex-military talent that is currently on the…”

Source: RevenueBase Database · checked Sep 27, 2026
17Indirect evidenceWalton-on-thames, United KingdomHQ checked Sep 27, 202611-5026 contacts →

Indirect evidence

“Welcome to Proactive.IT Appointments Ltd.”

Source: RevenueBase Database · checked Sep 27, 2026
18Indirect evidenceBeckenham, United KingdomHQ checked Sep 27, 202611-5026 contacts →

Indirect evidence

“DCL Search reduce clients risk by identifying attracting the very best Cyber / Information Security Talent in the industry.”

Source: RevenueBase Database · checked Sep 27, 2026
19Indirect evidenceManchester, United KingdomHQ checked Sep 27, 202611-5025 contacts →

Indirect evidence

“We help companies build teams with people you won’t find on the market.”

Source: RevenueBase Database · checked Sep 27, 2026
20Partial evidenceEpsom, United KingdomHQ checked Sep 27, 202611-5024 contacts →

Partial evidence

“Established in Carlton Recruitment is a successful Recruitment Agency with an excellent reputation for supplying high quality staffing solutions.”

Source: RevenueBase Database · checked Sep 27, 2026
21Indirect evidenceBath, United KingdomHQ checked Sep 27, 202611-5023 contacts →

Indirect evidence

“At Intaso we are firm believers that not every business has the same Cyber/ Information Security talent shortages and demands a bespoke offering.”

Source: RevenueBase Database · checked Sep 27, 2026
22Indirect evidenceMilton Keynes, United KingdomHQ checked Sep 27, 202611-5023 contacts →

Indirect evidence

“GTS Group delivers a global consultative, professional, and intelligence-driven approach to staffing, connecting brands with the best talent.”

Source: RevenueBase Database · checked Sep 27, 2026
23Partial evidenceBristol, United KingdomHQ checked Sep 27, 202611-5022 contacts →

Partial evidence

“With over 25 years of expertise in recruitment for global blue-chip clients, we are driven by a passion for connecting high-caliber talent with the most ambitious organizations.”

Source: RevenueBase Database · checked Sep 27, 2026
24Indirect evidenceSutton Coldfield, United KingdomHQ checked Sep 27, 202611-5021 contacts →

Indirect evidence

“Founded in 1994, Probe has grown into a highly professional and diverse resourcing organisation.”

Source: RevenueBase Database · checked Sep 27, 2026
25Indirect evidenceLondon, United KingdomHQ checked Sep 27, 20261-1020 contacts →

Indirect evidence

“We connect top cybersecurity and eDiscovery talent at Iceberg Cyber Security with the most innovative companies worldwide.”

Source: RevenueBase Database · checked Sep 27, 2026

Showing 25 of 283 clearance recruitment firms based in the United Kingdom

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Clearance recruitment firms based in the United Kingdom at a glance

As of Sep 27, 2026
33.4%Verified-email coverage
8.7Average contacts per company
1-10Median size (employees)
36.0%Largest-city concentration · London
Sep 27, 2026Page data refreshed

Companies by employee count

1-10
188
11-50
76
51-200
16
201-500
2
501-1,000
1

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 283 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 clearance recruitment 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 “clearance recruitment 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 clearance recruitment 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 clearance recruitment 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, 825 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 27, 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.

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 clearance recruitment 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 clearance recruitment firms are there based in the United Kingdom?

RevenueBase identified 283 clearance recruitment 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?

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

Which city has the most clearance recruitment firms?

London leads with 102 headquartered companies, followed by Manchester (15) and Bristol (11).

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 825 verified decision-maker contacts tracked across these 283 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 27, 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.