Company lists · Data refreshed September 2026

Top 23 Telecommunications systems integrators based in London, United Kingdom

Name: Telecommunications systems integrators based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 13, 2026 116 companies tracked

RevenueBase identified 116 telecommunications systems integrators headquartered in London, United Kingdom as of September 2026 and tracks 1,748 professional contacts across them, including 551 with verified work emails and 91 with mobile numbers. London is the largest hub.

This list covers telecommunications systems integrators headquartered in London, 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 13, 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 13, 2026 86% judged on-target in blind review

116Companies

1,748Contacts tracked

551Verified emails

91Mobile numbers

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The 23 largest telecommunications systems integrators based in London, United Kingdom

Ranked by team size

Top 23 of 116 telecommunications systems integrators based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 13, 2026. RevenueBase Smart Search rates how each company's information relates to telecommunications systems integrators: 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	Maintel	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	201-500	341 contacts →
	Indirect evidence “Maintel is a communications managed services provider.” Source: RevenueBase Database · checked Sep 13, 2026
2	Crossover	Strong evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	82 contacts →
	Strong evidence “Crossover is a leading audiovisual systems integrator – we deliver AV that’s high quality, powerful, simple to use, and reliable.” Source: RevenueBase Database · checked Sep 13, 2026
3	Radiocoms Systems LTD	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	57 contacts →
	Partial evidence “Radiocoms Systems Limited is a mature communications company of some 50 years and is now the UK’s leading independent communications supplier specialising in the design…” Source: RevenueBase Database · checked Sep 13, 2026
4	Electranet UK Limited	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	49 contacts →
	Indirect evidence “Electranet’s mission is to be a preferred partner to the public and private sectors, bringing competitively priced, secure and innovative solutions to the market.” Source: RevenueBase Database · checked Sep 13, 2026
5	Commercis	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	33 contacts →
	Indirect evidence “With over three decades of experience in the communications and technology sector, Commercis has established itself as a trusted leader in delivering global connectivity…” Source: RevenueBase Database · checked Sep 13, 2026
6	MIX Consultancy LTD	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	32 contacts →
	Indirect evidence “MiX is an independent consultancy specialising in IT Infrastructure, Communication, Data Centre, Audio Visual, Physical Security & SMART Buildings Technology Solutions.” Source: RevenueBase Database · checked Sep 13, 2026
7	Principle Networks	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	24 contacts →
	Indirect evidence “Principle Networks works with commercial and regulated organisations to reduce cyber risk and cost by simplifying security and network architecture.” Source: RevenueBase Database · checked Sep 13, 2026
8	Infrastructure Design Solutions	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	24 contacts →
	Indirect evidence “IDS is a global ICT and security infrastructure design consultancy, specialized in structured cabling design and physical security engineering solutions that meet the highest…” Source: RevenueBase Database · checked Sep 13, 2026
9	Igxglobal	Strong evidence	London, United KingdomHQ checked Sep 13, 2026	1,001-5,000	18 contacts →
	Strong evidence “IGXGlobal is a technology systems integrator at the forefront of digital transformation.” Source: RevenueBase Database · checked Sep 13, 2026
10	Kumoco	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	18 contacts →
	Indirect evidence “Welcome to Kumoco.” Source: RevenueBase Database · checked Sep 13, 2026
11	Halo Technology	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	15 contacts →
	Indirect evidence “Every business has a different set of network, communication and technical requirements.” Source: RevenueBase Database · checked Sep 13, 2026
12	A3&o Limited	Strong evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	14 contacts →
	Strong evidence “A3 & O, the leading telecommunication System Integrator and Solution Provider; The company provides state of the art technologies and turnkey solutions to its clients across the…” Source: RevenueBase Database · checked Sep 13, 2026
13	Sylversys	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	14 contacts →
	Indirect evidence “SYLVERSYS is a solutions integration firm with a specialty in providing secure computer and network products/solutions for businesses and organizations in the private and public…” Source: RevenueBase Database · checked Sep 13, 2026
14	Twentytwo Integration	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	12 contacts →
	Partial evidence “TwentyTwo Integration are experts in bringing together audio, television, lighting, telephone & communications, data networks, security & other bespoke systems into a unified…” Source: RevenueBase Database · checked Sep 13, 2026
15	Panoptic Technology	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	1-10	12 contacts →
	Partial evidence “PanOptic Technology are innovative IT & Telecom solution providers Panoptic Technology provides a range of telecommunication services to a variety of global institutions, such as…” Source: RevenueBase Database · checked Sep 13, 2026
16	The Workplace Technology Group	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	11 contacts →
	Indirect evidence “At The Workplace Technology Group, we are passionate about transforming workplaces by creating seamless, intuitive and engaging work environments that enhance productivity and…” Source: RevenueBase Database · checked Sep 13, 2026
17	NM Cabling Solutions	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	1-10	9 contacts →
	Partial evidence “NM Cabling are a leading data cabling installer assisting IT, Technology, Value Added Re-sellers and Telephone Systems Companies in the London, South and surrounding areas with a…” Source: RevenueBase Database · checked Sep 13, 2026
18	Pxosys	Strong evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	9 contacts →
	Strong evidence “Pxosys is a Digital Systems Integrator and Solutions Provider.” Source: RevenueBase Database · checked Sep 13, 2026
19	7fivefive	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	1-10	8 contacts →
	Partial evidence “7fivefive provides a unique combination of technical, business, and industry knowledge that is channelled into a complete service system integration for the broadcast industry.” Source: RevenueBase Database · checked Sep 13, 2026
20	Kbtl Telecoms	Strong evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	8 contacts →
	Strong evidence “Established in 2006, KBTL specialises in Telecommunications Systems Delivery across the Rail, Power and General Transportation sectors.” Source: RevenueBase Database · checked Sep 13, 2026
21	Smart Connect Telecom	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	1-10	8 contacts →
	Indirect evidence “Smart Connect Telecom is one of the UK’s leading providers in voice and data communications.” Source: RevenueBase Database · checked Sep 13, 2026
22	CSL Integration LTD	Indirect evidence	London, United KingdomHQ checked Sep 13, 2026	11-50	8 contacts →
	Indirect evidence “Who we are - Established in 2004 CSL Integration is a technology solutions Company providing tailored voice, data and video services that add value and improve the way Companies…” Source: RevenueBase Database · checked Sep 13, 2026
23	Ansador Fire & Security	Partial evidence	London, United KingdomHQ checked Sep 13, 2026	51-200	6 contacts →
	Partial evidence “Ansador Ltd has been privately owned since it was founded in 1982, providing system solutions to corporate and global clients across EMEA.” Source: RevenueBase Database · checked Sep 13, 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: telecommunications systems integrators. 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 telecommunications systems integrators.
Partial evidence: Its own public description names part of telecommunications systems integrators, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name telecommunications systems integrators. 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 23 of 116 telecommunications systems integrators based in London, United Kingdom

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Telecommunications systems integrators based in London, United Kingdom at a glance

As of Sep 13, 2026

31.5%Verified-email coverage

5.2%Mobile-number coverage

15.1Average contacts per company

11-50Median size (employees)

114.7%Largest-city concentration · London

Sep 13, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

Freshness & accuracy

How recently the business emails were verified and the company information checked

Email last verified

Median 15.0d

4300–30

11731–60

161–90

190–180

2180+

Company record updated

Median 80.0d

00–30

38231–60

1,05661–90

24090–180

70180+

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 telecommunications systems integrators, 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 London, United Kingdom whose own description of what they do matches “telecommunications systems integrators”. 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 telecommunications systems integrators), 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 telecommunications systems integrators, and records with no verified work email. Companies headquartered outside London 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, 551 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 13, 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.

Telecommunications systems integrators by metro in the United Kingdom

Telecommunications systems integrators in London133

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 telecommunications systems integrators, 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 telecommunications systems integrators are there based in London, United Kingdom?

RevenueBase identified 116 telecommunications systems integrators headquartered in London, 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?

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

Which city has the most telecommunications systems integrators?

London leads with 133 headquartered companies, followed by Birmingham (19) and Glasgow (18).

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 551 verified decision-maker contacts tracked across these 116 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 13, 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.