Company lists · Data refreshed September 2026

Top 25 Backbone development companies based in the United Kingdom

Name: Backbone development companies based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 310 companies tracked

RevenueBase identified 310 backbone development companies headquartered in the United Kingdom as of September 2026 and tracks 12,826 professional contacts across them, including 5,457 with verified work emails. London is the largest hub.

This list covers backbone development companies 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 19, 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 19, 2026 86% judged on-target in blind review

310Companies

12,826Contacts tracked

5,457Verified emails

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The 25 largest backbone development companies based in the United Kingdom

Ranked by team size

Top 25 of 310 backbone development companies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to backbone development companies: 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	Colt Technology Services	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	5,001-10,000	6,233 contacts →
	Indirect evidence “Colt Technology Services (Colt) is a global digital infrastructure company which creates extraordinary connections to help businesses succeed.” Source: RevenueBase Database · checked Sep 19, 2026
2	Kelly Group	Indirect evidence	Wembley, United KingdomHQ checked Sep 19, 2026	1,001-5,000	1,053 contacts →
	Indirect evidence “Established in 1985 to support the emerging UK cable television market, Kelly Group has diversified to meet the needs of our clients.” Source: RevenueBase Database · checked Sep 19, 2026
3	Indigo	Indirect evidence	Magor, United KingdomHQ checked Sep 19, 2026	201-500	470 contacts →
	Indirect evidence “Indigo engineers a digital future by designing, deploying, and supporting digital infrastructure for network owners and operators.” Source: RevenueBase Database · checked Sep 19, 2026
4	EXA Infrastructure	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	201-500	416 contacts →
	Indirect evidence “EXA Infrastructure is an award-winning portfolio company of I Squared Capital and one of the largest dedicated digital infrastructure platforms throughout Europe, connecting North…” Source: RevenueBase Database · checked Sep 19, 2026
5	Magdalene	Indirect evidence	St Ives, United KingdomHQ checked Sep 19, 2026	201-500	273 contacts →
	Indirect evidence “Magdalene provides comprehensive independent solutions which address the individual needs of our customers throughout the Telecommunications Industry.” Source: RevenueBase Database · checked Sep 19, 2026
6	Sudlows	Indirect evidence	Manchester, United KingdomHQ checked Sep 19, 2026	201-500	228 contacts →
	Indirect evidence “Sudlows is a multi-award winning Critical Infrastructures, Enterprise Services and Facilities Management specialist which provides a full range of technical services for…” Source: RevenueBase Database · checked Sep 19, 2026
7	Technetix	Indirect evidence	Albourne, United KingdomHQ checked Sep 19, 2026	51-200	190 contacts →
	Indirect evidence “Technetix provides critical broadband infrastructure for network operators globally.” Source: RevenueBase Database · checked Sep 19, 2026
8	Viberoptix	Indirect evidence	Coalisland, United KingdomHQ checked Sep 19, 2026	501-1,000	158 contacts →
	Indirect evidence “Viberoptix delivers frontline services to fibre networks providers across the UK and Ireland.” Source: RevenueBase Database · checked Sep 19, 2026
9	Beacon Comms	Indirect evidence	Tavistock, United KingdomHQ checked Sep 19, 2026	201-500	151 contacts →
	Indirect evidence “Beacon Comms is the trading name of Beacon Communication Services Ltd.” Source: RevenueBase Database · checked Sep 19, 2026
10	Linbrooke Services LTD	Indirect evidence	Sheffield, United KingdomHQ checked Sep 19, 2026	201-500	89 contacts →
	Indirect evidence “We connect people, technologies and locations, enabling service providers, OEM's and internet service providers to deploy, scale, support and maintain network infrastructure…” Source: RevenueBase Database · checked Sep 19, 2026
11	Rapid Response Telecoms LTD	Indirect evidence	Barnsley, United KingdomHQ checked Sep 19, 2026	201-500	79 contacts →
	Indirect evidence “As a family run business for over 30 years, here at Rapid Response Telecoms we take great pride in our services being a tier 1 supplier to many prestigious Alt Nets.” Source: RevenueBase Database · checked Sep 19, 2026
12	Novo Technologies Limited	Indirect evidence	Irvine, United KingdomHQ checked Sep 19, 2026	51-200	79 contacts →
	Indirect evidence “Providing World-class Communication Network and Security Infrastructure Solutions Novo Technologies is dedicated to projects excellence, Novo Technologies undertakes end to end…” Source: RevenueBase Database · checked Sep 19, 2026
13	Installation Technology Limited	Indirect evidence	Reading, United KingdomHQ checked Sep 19, 2026	51-200	74 contacts →
	Indirect evidence “Installation Technology has over thirty years of experience in providing technical solutions in advanced communication systems.” Source: RevenueBase Database · checked Sep 19, 2026
14	VEA Telecoms	Indirect evidence	Bracknell, United KingdomHQ checked Sep 19, 2026	51-200	63 contacts →
	Indirect evidence “VEA Telecoms is a trading name of Vea Group LTD \| Your Trusted Network Partner We deliver fast, reliable, and full turnkey telecom solutions to UK network providers.” Source: RevenueBase Database · checked Sep 19, 2026
15	Kcom Wholesale	Indirect evidence	Hull, United KingdomHQ checked Sep 19, 2026	501-1,000	61 contacts →
	Indirect evidence “KCOM has been a driver of innovation in the telecoms industry for more than a century; pushing the boundaries and pioneering new technology from our earliest days as a local phone…” Source: RevenueBase Database · checked Sep 19, 2026
16	Splicegroup	Indirect evidence	Drighlington, United KingdomHQ checked Sep 19, 2026	51-200	59 contacts →
	Indirect evidence “We are a leading provider of Fibre Management Products and Services.” Source: RevenueBase Database · checked Sep 19, 2026
17	The Cabling Group	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	58 contacts →
	Partial evidence “The Cabling Group provides robust and scalable structured cabling solutions, forming the backbone of modern workplace technology.” Source: RevenueBase Database · checked Sep 19, 2026
18	IDS Group	Indirect evidence	Fleet, United KingdomHQ checked Sep 19, 2026	51-200	56 contacts →
	Indirect evidence “IDS Group are a global data centre and colocation specialist providing a variety of services to support our customers around the world from both our UK and Netherlands office…” Source: RevenueBase Database · checked Sep 19, 2026
19	Northsky Group	Indirect evidence	Castleford, United KingdomHQ checked Sep 19, 2026	11-50	55 contacts →
	Indirect evidence “We design and build critical telecoms and utility infrastructure networks.” Source: RevenueBase Database · checked Sep 19, 2026
20	MMX	Indirect evidence	Solihull, United KingdomHQ checked Sep 19, 2026	51-200	54 contacts →
	Indirect evidence “Here at MMX (part of the TXO group), we're experts in providing communication network design, build & support services.” Source: RevenueBase Database · checked Sep 19, 2026
21	Networks Centre	Indirect evidence	West Sussex, United KingdomHQ checked Sep 19, 2026	51-200	49 contacts →
	Indirect evidence “Service-driven premium supply partners for network infrastructure systems.” Source: RevenueBase Database · checked Sep 19, 2026
22	Callan Connect	Indirect evidence	Birmingham, United KingdomHQ checked Sep 19, 2026	51-200	46 contacts →
	Indirect evidence “Callan Connect is a Civil and Fibre Engineering company based in Aston, Birmingham specialising in the telecommunications industry.” Source: RevenueBase Database · checked Sep 19, 2026
23	Kntc LTD	Indirect evidence	Sidcup, United KingdomHQ checked Sep 19, 2026	51-200	40 contacts →
	Indirect evidence “KNTC builds infrastructure for telecoms to deliver next generation access and connectivity for voice and data communication services on behalf of consumers and businesses.” Source: RevenueBase Database · checked Sep 19, 2026
24	Datel Group LTD	Indirect evidence	Weston-super-mare, United KingdomHQ checked Sep 19, 2026	51-200	39 contacts →
	Indirect evidence “Structured Cabling and Network Solutions that Power Your Progress” Source: RevenueBase Database · checked Sep 19, 2026
25	Hellermanntyton Connectivity	Indirect evidence	Northampton, United KingdomHQ checked Sep 19, 2026	51-200	36 contacts →
	Indirect evidence “Delivering elegant, effective structured cabling solutions" Founded in 1988, HellermannTyton Data Ltd is an established and global leader in the provision of fibre network…” Source: RevenueBase Database · checked Sep 19, 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: backbone development companies. 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 backbone development companies.
Partial evidence: Its own public description names part of backbone development companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name backbone development companies. 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 310 backbone development companies based in the United Kingdom

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Backbone development companies based in the United Kingdom at a glance

As of Sep 19, 2026

42.5%Verified-email coverage

41.4Average contacts per company

11-50Median size (employees)

15.2%Largest-city concentration · London

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

105

11-50

123

51-200

201-500

501-1,000

1,001-5,000

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 310 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 backbone development companies, 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 “backbone development companies”. 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 backbone development companies), 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 backbone development companies, 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, 5,457 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 19, 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.

Backbone development companies by metro

Backbone development companies in London47

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 backbone development companies, 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 backbone development companies are there based in the United Kingdom?

RevenueBase identified 310 backbone development companies 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?

Colt Technology Services, headquartered in London, tops this list with the largest team on record.

Which city has the most backbone development companies?

London leads with 47 headquartered companies, followed by Manchester (10) and Northampton (8).

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 5,457 verified decision-maker contacts tracked across these 310 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 19, 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.