Company lists · Data refreshed September 2026

Top 25 Lead generation call centers based in the United Kingdom

Name: Lead generation call centers based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 4, 2026 814 companies tracked

RevenueBase identified 814 lead generation call centers headquartered in the United Kingdom as of September 2026 and tracks 7,621 professional contacts across them, including 1,307 with verified work emails and 378 with mobile numbers. London is the largest hub.

This list covers lead generation call centers 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, how directly it supports the match, and when it was last checked. Data refreshed September 4, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 Match evidence on every row Refreshed Sep 4, 2026 86% judged on-target in blind review

814Companies

7,621Contacts tracked

1,307Verified emails

378Mobile numbers

Unlock all 814 companies Free signup · no credit card · 500 free credits

The 25 largest lead generation call centers based in the United Kingdom

Ranked by team size

Top 25 of 814 lead generation call centers based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 4, 2026. Evidence rates how directly each company's own description names lead generation call centers: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#	Company	Headquarters	Employees	Contacts
1	QualifaStrong evidence	Brighton, United KingdomHQ checked Sep 4, 2026	51-200	440
	“We are an award winning multilingual lead generation and market research service provider for B2B publishing, marketing, events and tech companies.” Source: company website · checked Sep 4, 2026
2	The Telemarketing CompanyIndirect evidence	Brighton, United KingdomHQ checked Sep 4, 2026	201-500	242
	“The Telemarketing Company is one of the UK's most trusted telemarketing agencies, delivering flexible, high-quality voice services, including pre and post sales research…” Source: company website · checked Sep 4, 2026
3	InterlinkIndirect evidence	London, United KingdomHQ checked Sep 4, 2026	51-200	181
	“We help our clients supercharge their sales.” Source: company website · checked Sep 4, 2026
4	AIR MarketingStrong evidence	Exeter, United KingdomHQ checked Sep 4, 2026	51-200	123
	“Since 2016, Air Marketing has been the trusted outsourced sales and lead generation agency in the UK for ambitious B2B businesses.” Source: company website · checked Sep 4, 2026
5	GCLPartial evidence	Birmingham, United KingdomHQ checked Sep 4, 2026	51-200	120
	“GCL, with its unique, non-scripted approach to telemarketing and related marketing services, has for over 30 years established an enviable reputation for providing winning lead…” Source: company website · checked Sep 4, 2026
6	EC Outsourcing Powered By Ison XperiencesIndirect evidence	Doxford International Business Park, United KingdomHQ checked Sep 4, 2026	1,001-5,000	115
	“EC Outsourcing is one of the UK's leading outsourced contact centres.” Source: company website · checked Sep 4, 2026
7	DurhamlaneIndirect evidence	Newcastle Upon Tyne, United KingdomHQ checked Sep 4, 2026	51-200	114
	“More than SDR Outsourcing.” Source: company website · checked Sep 4, 2026
8	FLOWDIndirect evidence	Manchester, United KingdomHQ checked Sep 4, 2026	11-50	106
	“Flowd is an award-winning sales prospecting specialist based in the UK, Europe & US.” Source: company website · checked Sep 4, 2026
9	Impact Call CentreIndirect evidence	Romsey, United KingdomHQ checked Sep 4, 2026	201-500	55
	“Employing over 250 staff, we are a well-established, highly regarded and successful outsourced multi-channel contact centre.” Source: company website · checked Sep 4, 2026
10	Marathon B2BIndirect evidence	London, United KingdomHQ checked Sep 4, 2026	51-200	52
	“We find ourselves in an era of remarkable technological advancement.” Source: company website · checked Sep 4, 2026
11	FLY PIE LTDIndirect evidence	London, United KingdomHQ checked Sep 4, 2026	51-200	49
	“At Fly Pie, sales outsourcing isn’t a “done-for-you” service, it’s a growth engine we build with you.” Source: company website · checked Sep 4, 2026
12	4marketingPartial evidence	Portsmouth, United KingdomHQ checked Sep 4, 2026	11-50	47
	“4Marketing is a direct marketing agency devoted to generating new business opportunities for its clients through its focused new generation of telemarketing professionals.” Source: company website · checked Sep 4, 2026
13	Advance ConnectsStrong evidence	Ellesmere Port, United KingdomHQ checked Sep 4, 2026	51-200	45
	“Advance Connects are a B2B telemarketing, lead generation & appointment scheduling experts, operating within various sectors including construction, built environment, industrial…” Source: company website · checked Sep 4, 2026
14	Broadley SpeakingIndirect evidence	Tavistock, United KingdomHQ checked Sep 4, 2026	11-50	45
	“With over three decades of experience, we partner with B2B sales and marketing teams to drive and nurture new customer acquisition - securing conversations with the right…” Source: company website · checked Sep 4, 2026
15	Beanstalk MarketingStrong evidence	Southend On Sea, United KingdomHQ checked Sep 4, 2026	11-50	43
	“Beanstalk is an integrated B2B Telemarketing and Lead Generation agency dedicated to helping our customers win new business.” Source: company website · checked Sep 4, 2026
16	First4lawyers LTDStrong evidence	Huddersfield, United KingdomHQ checked Sep 4, 2026	51-200	43
	“Launched in 2008, First4Lawyers has grown to become the UK’s largest multi-award winning, independent legal marketing collective, specialising in lead generation for personal…” Source: company website · checked Sep 4, 2026
17	Parallel Partnerships LTDIndirect evidence	Leeds, United KingdomHQ checked Sep 4, 2026	51-200	43
	“B2B and B2C outsourced Telemarketing agency.” Source: company website · checked Sep 4, 2026
18	ConvertaIndirect evidence	Harrogate, United KingdomHQ checked Sep 4, 2026	11-50	38
	“It’s simple.” Source: company website · checked Sep 4, 2026
19	SentramaIndirect evidence	Bristol, United KingdomHQ checked Sep 4, 2026	11-50	38
	“Highly qualified B2B Sales Appointments you can trust.” Source: company website · checked Sep 4, 2026
20	Think Pipeline LTDStrong evidence	Woking, United KingdomHQ checked Sep 4, 2026	51-200	38
	“We are an ambitious and agile lead generation business, who exist to genuinely accelerate your growth!” Source: company website · checked Sep 4, 2026
21	Econtact Services-Telco ExpertsIndirect evidence	Glasgow, United KingdomHQ checked Sep 4, 2026	11-50	37
	“eContact Services Limited was founded in 2002 by management with over 40 years of IT and Telecoms experience.” Source: company website · checked Sep 4, 2026
22	1 Stop Data LTDStrong evidence	Ewell, United KingdomHQ checked Sep 4, 2026	51-200	35
	“1 Stop Data offers the best of breed Marketing, Lead Generation and Call Centre services.” Source: company website · checked Sep 4, 2026
23	LeadlyPartial evidence	Manchester, United KingdomHQ checked Sep 4, 2026	51-200	34
	“Delivering leads at scale to the most trustworthy financial companies nationwide.” Source: company website · checked Sep 4, 2026
24	Paragon Marketing ProjectsStrong evidence	Portsmouth, United KingdomHQ checked Sep 4, 2026	51-200	32
	“Working with clients across a variety of sectors, Paragon is a leading provider of B2B lead generation and appointment setting marketing projects with vast experience in creating…” Source: company website · checked Sep 4, 2026
25	IT Focus Telemarketing LTDIndirect evidence	Bradford On Avon, United KingdomHQ checked Sep 4, 2026	11-50	32
	“IT Focus Telemarketing Ltd is an agency that specialises in working with information technology companies.” Source: company website · checked Sep 4, 2026

Showing 25 of 814 lead generation call centers based in the United Kingdom

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Lead generation call centers based in the United Kingdom at a glance

As of Sep 4, 2026

1-10Median size (employees)

LondonLargest hub · 249 HQs

378Contacts with mobile numbers

Sep 4, 2026Data refreshed

Companies by employee count

1-10

500

11-50

229

51-200

201-500

501-1,000

1,001-5,000

Verified emails by last verification

0–30

31–60

111

61–90

691

90–180

494

180+

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 lead generation call centers, so some rows will be adjacent to the category rather than pure plays. The description and evidence 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 SmartSearch, 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 “lead generation call centers”. Matching reads each company's description, not its industry code or its name.
What we exclude: Companies whose own description does not clearly place them among lead generation call centers, 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 an evidence 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, 1,307 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 4, 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.

Lead generation call centers by metro

Lead generation call centers in London249
Lead generation call centers in Manchester46

Frequently asked

How many lead generation call centers are there based in the United Kingdom?

RevenueBase identified 814 lead generation call centers 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?

Qualifa, headquartered in Brighton, tops this list with the largest team on record.

Which city has the most lead generation call centers?

London leads with 249 headquartered companies, followed by Manchester (46) and Birmingham (21).

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 1,307 verified decision-maker contacts tracked across these 814 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 4, 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 SmartSearch, 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.