Company lists · Data refreshed September 2026
Top 25 Quality assurance staffing firms based in the United Kingdom
RevenueBase identified 641 quality assurance staffing firms headquartered in the United Kingdom as of September 2026 and tracks 7,117 professional contacts across them, including 1,404 with verified work emails. London is the largest hub.
This list covers quality assurance staffing 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 29, 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.
The 25 largest quality assurance staffing firms based in the United Kingdom
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 558 contacts → | ||||
Indirect evidence “We’re THE RECRUITMENT Co.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 2 | 355 contacts → | ||||
Partial evidence “A24 Group is a leading international provider of medical staffing and personnel management services.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 3 | 203 contacts → | ||||
Partial evidence “At Proclinical Staffing, our life science recruitment services support our partners with permanent and contract vacancies by connecting them with specialist talent across the…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 4 | 190 contacts → | ||||
Indirect evidence “Welcome to HRC Recruitment Looking for a job in Glasgow, Edinburgh or the rest of Scotland?” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 5 | 161 contacts → | ||||
Partial evidence “With over 30 years experience of serving clients Internationally and filling their IT and Life Sciences staffing vacancies, both Contract and Permanent, you can be assured we will…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 6 | 153 contacts → | ||||
Partial evidence “Ambition 24hours – Leading the Way in 24/7 Healthcare Staffing For nearly 28 years, Ambition 24hours has been at the forefront of healthcare staffing, providing reliable…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 7 | 142 contacts → | ||||
Indirect evidence “Experience in both temporary and permanent recruitment, Swanstaff Ltd stands as a beacon of expertise, dedication, and success in matching top talent with exceptional…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 8 | 134 contacts → | ||||
Indirect evidence “BMSL was formed in 1996 to provide specialist support to the construction industry.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 9 | 125 contacts → | ||||
Indirect evidence “Skilliantech Ltd, trading as “SkillRecruit”, is a specialist IT and Engineering recruitment agency delivering comprehensive coverage of recruitment services across all industries…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 10 | 116 contacts → | ||||
Indirect evidence “In operation since 1977, our reputation for excellence has come from providing Companies and Individuals with an outstanding recruitment service to suit their every need.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 11 | 91 contacts → | ||||
Strong evidence “Select Recruitment was established in 1995 to provide a high quality and personal staffing service to clients and candidates.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 12 | 88 contacts → | ||||
Indirect evidence “Careermakers Recruitment is amongst the top recruiters in the country.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 13 | 70 contacts → | ||||
Strong evidence “Qniverse is your trusted Quality Assurance service partner that stands at the forefront of a paradigm shift in QA by redefining quality.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 14 | 66 contacts → | ||||
Indirect evidence “Dorset's leading local independent recruitment agency.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 15 | 62 contacts → | ||||
Indirect evidence “We have a clear vision – “We aim to challenge and transform the recruitment industry.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 16 | 58 contacts → | ||||
Partial evidence “Howard Finley Ltd was founded in 2016 by a team of experienced consultants with the aim of delivering a bespoke high quality recruitment service focused on the needs our clients…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 17 | 55 contacts → | ||||
Indirect evidence “Integra People is a leading national recruitment consultancy providing temporary, contract and permanent resourcing solutions to the Construction, IT & Telecoms, Engineering…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 18 | 54 contacts → | ||||
Indirect evidence “Our People Are Your People.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 19 | 54 contacts → | ||||
Partial evidence “24-7 Staffing was formed in 2004 in Chippenham, as an independently owned recruitment business, who passionately strive to deliver your ideal staffing solutions.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 20 | 53 contacts → | ||||
Indirect evidence “X4 Technology partner with businesses across the entire technology spectrum, from early-stage R&D to commercial enterprises to provide world-class talent solutions.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 21 | 51 contacts → | ||||
Indirect evidence “In a highly technical industry of Information Technology, Warriorz Technologies Ltd is paving the way in Human Resource and Software consulting across the globe.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 22 | 49 contacts → | ||||
Indirect evidence “Powering Global STEM | Discover the Power of a Partner.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 23 | 49 contacts → | ||||
Indirect evidence “Rotherwood Recruitment are established multi-sector recruitment specialists operating across West & North Yorkshire and East Lancashire.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 24 | 47 contacts → | ||||
Partial evidence “ZigZag QA is your trusted worldwide quality leader, offering true global reach and unrivaled expertise to reduce risk and efforts.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 25 | 45 contacts → | ||||
Partial evidence “Blackfield Associates works in partnership with our clients to identify and deliver the right staffing solution to support contract, permanent and managed work programmes.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
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: quality assurance staffing 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 quality assurance staffing firms.
- Partial evidence
- Its own public description names part of quality assurance staffing firms, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name quality assurance staffing 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 641 quality assurance staffing firms based in the United Kingdom
See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 1,404 reachable decision-makers.
Free signup · no credit card
Quality assurance staffing firms based in the United Kingdom at a glance
As of Sep 29, 2026Companies by employee count
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 641 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 quality assurance staffing 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 “quality assurance staffing 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 quality assurance staffing 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 quality assurance staffing 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, 1,404 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 29, 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.
Quality assurance staffing firms by metro
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 quality assurance staffing 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 quality assurance staffing firms are there based in the United Kingdom?
RevenueBase identified 641 quality assurance staffing 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 Recruitment CO, headquartered in Northampton, tops this list with the largest team on record.
Which city has the most quality assurance staffing firms?
London leads with 156 headquartered companies, followed by Manchester (16) and Birmingham (12).
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 1,404 verified decision-maker contacts tracked across these 641 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 29, 2026.
Ready to reach these companies? Verified emails and direct dials for all 641 quality assurance staffing firms based in the United Kingdom. Start with a free account, no credit card.
Download this list →Related lists
Quality assurance staffing firms by geography
- Quality assurance staffing firms based in Mississauga, Canada
- Quality assurance staffing firms based in Toronto, Canada
- Quality assurance staffing firms based in Paris, France
- Quality assurance staffing firms based in Berlin, Germany
- Quality assurance staffing firms based in Hamburg, Germany
- Quality assurance staffing firms based in Bangalore, India
- Quality assurance staffing firms based in Hyderabad, India
- Quality assurance staffing firms based in Stockholm, Sweden
- Quality assurance staffing firms based in London, United Kingdom
- Quality assurance staffing firms based in Alpharetta, United States
- Quality assurance staffing firms based in Atlanta, United States
- Quality assurance staffing firms based in Austin, United States
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.
More company lists
- All company lists
- Lists by location
- Lists A-Z
- New lists
- Quality assurance staffing firms based in Mississauga, Canada
- Quality assurance staffing firms based in Toronto, Canada
- Quality assurance staffing firms based in Paris, France
- Quality assurance staffing firms based in Berlin, Germany
- Quality assurance staffing firms based in Hamburg, Germany
- Quality assurance staffing firms based in Bangalore, India