Company lists · Data verified August 2026
Top 10 Call centers based in London, United Kingdom
Use this directory to identify 57 call centers based in London, United Kingdom, with 1,002 listed contacts and 64 listed email addresses. The directory was last updated in August 2026; London is the single most-represented city among the companies on the list.
Call centers handle inbound and outbound phone interactions for clients, including customer service, sales, technical support, appointment setting, and other business communications. This list covers companies that provide call center services directly to businesses or organizations, including inbound, outbound, customer service, sales, support, and appointment-setting operations. Ranked by team size, largest first. Data current as of August 28, 2026.
The 10 largest call centers based in London, United Kingdom
Ranked by team size| # | Company | Verified emails |
|---|---|---|
| 1 |  Vertex Data Science | 1 |
| 2 |  Rsvp Media Response LTD | 22 |
| 3 |  Callcare | 13 |
| 4 |  Direct Response | 6 |
| 5 |  Voipstudio | 4 |
| 6 |  Real Calling | 7 |
| 7 | Confero Limited | 5 |
| 8 |  Alaouico | 4 |
| 9 |  Niche Marketing LTD | 1 |
| 10 | Nsibandze Outsourcing NOS | 1 |
Showing 10 of 57 call centers based in London, United Kingdom
See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 64 reachable decision-makers.
Free account · no credit card
Call centers based in London, United Kingdom at a glance
As of Aug 28, 2026Companies by employee count
Call centers by metro in the United Kingdom
| Metro | Companies |
|---|---|
| Call centers in London | 57 |
| Call centers in Manchester | 13 |
| Call centers in Bristol | 7 |
| Call centers in Leeds | 6 |
| Call centers in Sheffield | 5 |
| Call centers in Norwich | 4 |
| Call centers in Nottingham | 4 |
How this list was built
- Source
- The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
- Inclusion
- Companies whose own business descriptions match “call centers”, with match quality audited by blind human judging, and headquartered in London, United Kingdom.
- 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
- Contact records re-verify on a rolling cadence; 0 contacts on this list were re-verified in the last 30 days.
- Refresh
- Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.
Frequently asked
How many call centers are listed based in London, United Kingdom?
57 call centers are listed based in London, United Kingdom, with 1,002 contacts and 64 email addresses provided.
Which city has the most call centers in this list?
London is the single most-represented city among the companies on the list.
How can I contact call centers in this directory?
The directory includes 1,002 listed contacts and 64 listed email addresses for the call centers included.
Ready to reach these companies? Verified emails and direct dials for all 57 call centers based in London, United Kingdom. Start with a free account, no credit card.
Get the full listRelated lists
Call centers by geography
- Call centers based in the United States
- Call centers based in the United Kingdom
- Call centers based in Brazil
- Call centers based in Italy
- Call centers based in Canada
- Call centers based in Mexico
- Call centers based in Germany
- Call centers based in France
- Call centers based in Spain
- Call centers based in the Netherlands
- Call centers based in South Africa
- Call centers based in Argentina
Browse the directory
Browse: Companies home · Call centers in United Kingdom · All United Kingdom lists · All Call centers lists · New lists
About this data
RevenueBase is a B2B contact data platform. Its company graph covers 21.3 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, the same data that powers RevenueBase's B2B data products and the free research portal.