Company lists · Data refreshed September 2026

Top 25 Electrical systems integrators based in the United Kingdom

Name: Electrical systems integrators based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 3,480 companies tracked

RevenueBase identified 3,480 electrical systems integrators headquartered in the United Kingdom as of September 2026 and tracks 26,423 professional contacts across them, including 9,557 with verified work emails. London is the largest hub.

This list covers electrical systems integrators 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 28, 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 28, 2026 86% judged on-target in blind review

3,480Companies

26,423Contacts tracked

9,557Verified emails

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The 25 largest electrical systems integrators based in the United Kingdom

Ranked by team size

Top 25 of 3,480 electrical systems integrators based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to electrical 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	J Brand LTD	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	n/a	1,245 contacts →
	Partial evidence “Originally set up in 1933 by Joseph Brand as an electrical contracting and repair business in Margaret Street W1, the company today still operates today with the same guiding…” Source: RevenueBase Database · checked Sep 28, 2026
2	MJ Quinn	Indirect evidence	Prescot, United KingdomHQ checked Sep 28, 2026	1,001-5,000	1,126 contacts →
	Indirect evidence “At MJ Quinn we believe in creating great connections, with our customers, our people and our world.” Source: RevenueBase Database · checked Sep 28, 2026
3	Protec Fire And Security Group	Strong evidence	Nelson, United KingdomHQ checked Sep 28, 2026	501-1,000	493 contacts →
	Strong evidence “Through our team of over 900 creative individuals, we've positioned ourselves as a respected force as a life safety systems integrator.” Source: RevenueBase Database · checked Sep 28, 2026
4	Trinity Fire & Security Systems	Indirect evidence	Exeter, United KingdomHQ checked Sep 28, 2026	501-1,000	386 contacts →
	Indirect evidence “Trinity’s mission statement is simple - to provide high quality design, installation, commissioning and long term after care of Fire Detection, Fire Suppression, Life Safety and…” Source: RevenueBase Database · checked Sep 28, 2026
5	Capula	Partial evidence	Stone, United KingdomHQ checked Sep 28, 2026	201-500	351 contacts →
	Partial evidence “What we do \| With a focus on operational technology and digital transformation, Capula has been a leader in advanced system integration for decades; optimising efficiency &…” Source: RevenueBase Database · checked Sep 28, 2026
6	Kings Secure Technologies	Strong evidence	Bradford, United KingdomHQ checked Sep 28, 2026	501-1,000	326 contacts →
	Strong evidence “Kings Secure Technologies (KST) is a high-end, enterprise-level systems integrator.” Source: RevenueBase Database · checked Sep 28, 2026
7	ITI Group	Indirect evidence	Sheffield, United KingdomHQ checked Sep 28, 2026	201-500	234 contacts →
	Indirect evidence “For organisations facing the compounding threats of ageing assets, a retiring workforce, and evolving cyber attacks, the status quo is no longer an option.” Source: RevenueBase Database · checked Sep 28, 2026
8	BMSI	Strong evidence	Maidenhead, United KingdomHQ checked Sep 28, 2026	201-500	218 contacts →
	Strong evidence “BMSI is the UK’s largest & leading Independent systems integrator of Building Energy Management Systems (BEMS).” Source: RevenueBase Database · checked Sep 28, 2026
9	Scci Alphatrack	Partial evidence	Harlow, United KingdomHQ checked Sep 28, 2026	201-500	205 contacts →
	Partial evidence “Part of the SCCI Group, SCCI Alphatrack designs, installs, and maintains connected building systems across social housing, commercial property, new builds, and public sector…” Source: RevenueBase Database · checked Sep 28, 2026
10	Evolution Electronic Security Systems LTD	Strong evidence	Marlow, United KingdomHQ checked Sep 28, 2026	201-500	200 contacts →
	Strong evidence “Founded in 1996 we have grown into one of the UK and Ireland’s leading qualified and accredited security and fire systems integrators, working across Europe to bring together…” Source: RevenueBase Database · checked Sep 28, 2026
11	Openview Security Solutions Limited	Indirect evidence	Romford, United KingdomHQ checked Sep 28, 2026	201-500	200 contacts →
	Indirect evidence “OpenView Security Solutions is the UK’S largest privately owned independent security company and provides unique, innovative and technologically excellent solutions to meet…” Source: RevenueBase Database · checked Sep 28, 2026
12	Abec LTD	Strong evidence	Tewkesbury, United KingdomHQ checked Sep 28, 2026	51-200	175 contacts →
	Strong evidence “ABEC is one of the leading independent Building Management System (BMS) and Electrical Power Monitoring System (EPMS) specialists.” Source: RevenueBase Database · checked Sep 28, 2026
13	Gough & Kelly	Partial evidence	Leeds, United KingdomHQ checked Sep 28, 2026	51-200	157 contacts →
	Partial evidence “A premier provider of security products and services across England, Gough & Kelly was formed in 1988 to influence and inspire the security and electrical marketplace by providing…” Source: RevenueBase Database · checked Sep 28, 2026
14	Asee Group	Partial evidence	Newry, United KingdomHQ checked Sep 28, 2026	51-200	151 contacts →
	Partial evidence “ASEE Group is a leader in mechanical and electrical engineering, specialising in generator integration and full-service installations for 45+ years.” Source: RevenueBase Database · checked Sep 28, 2026
15	Frontline Security Solutions	Strong evidence	Chalfont St Peter, United KingdomHQ checked Sep 28, 2026	51-200	145 contacts →
	Strong evidence “Frontline Security Solutions is a global electronic security integrator specialising in Access Control, CCTV, Intruder and Intercom systems that protect people, property and…” Source: RevenueBase Database · checked Sep 28, 2026
16	Kempston Controls	Partial evidence	Rushden, United KingdomHQ checked Sep 28, 2026	201-500	139 contacts →
	Partial evidence “Kempston Controls is a leader in distributing electrical and mechanical industrial control and automation components.” Source: RevenueBase Database · checked Sep 28, 2026
17	DPS Group	Indirect evidence	Glenrothes, United KingdomHQ checked Sep 28, 2026	51-200	139 contacts →
	Indirect evidence “Shaping the future, together.” Source: RevenueBase Database · checked Sep 28, 2026
18	Cema LTD	Partial evidence	Nottingham, United KingdomHQ checked Sep 28, 2026	201-500	131 contacts →
	Partial evidence “CEMA was founded in 1987 in Nottingham, and has quickly grown to become one of the leading electrical engineering companies in the United Kingdom, specialising in understanding…” Source: RevenueBase Database · checked Sep 28, 2026
19	CINOS	Strong evidence	Frimley, United KingdomHQ checked Sep 28, 2026	51-200	119 contacts →
	Strong evidence “Cinos is an industry-leading, agile, and innovative systems integrator.” Source: RevenueBase Database · checked Sep 28, 2026
20	AF Switchgear	Indirect evidence	Sutton-in-ashfield, United KingdomHQ checked Sep 28, 2026	201-500	117 contacts →
	Indirect evidence “AF Switchgear is one of the UK's largest switchgear manufacturers and set the standard for LV Switchgear and Power Distribution.” Source: RevenueBase Database · checked Sep 28, 2026
21	European Electronique	Strong evidence	Eynsham, United KingdomHQ checked Sep 28, 2026	51-200	117 contacts →
	Strong evidence “European Electronique is a leading UK systems Integrator, specialising in the delivery of secure technology platforms including Hybrid IT, Cyber Security and Networking…” Source: RevenueBase Database · checked Sep 28, 2026
22	Darke & Taylor LTD	Partial evidence	Oxfordshire, United KingdomHQ checked Sep 28, 2026	51-200	112 contacts →
	Partial evidence “Our mission is to excel in the design, installation and maintenance of the electro-technical systems that connect to create fit for purpose building environments.” Source: RevenueBase Database · checked Sep 28, 2026
23	G & A Barnie Group LTD	Indirect evidence	Inverness, United KingdomHQ checked Sep 28, 2026	201-500	109 contacts →
	Indirect evidence “Premier quality workmanship and personal attention are characteristics of G&A Barnie.” Source: RevenueBase Database · checked Sep 28, 2026
24	OE Electrics LTD	Indirect evidence	Wakefield, United KingdomHQ checked Sep 28, 2026	201-500	107 contacts →
	Indirect evidence “Bring your furniture to life with OE: masters in design & innovation of power & data delivery modules since 1986.” Source: RevenueBase Database · checked Sep 28, 2026
25	Rock Power Connections LTD	Partial evidence	Bromsgrove, United KingdomHQ checked Sep 28, 2026	51-200	105 contacts →
	Partial evidence “Rock Power Connections are experts in electrical connections with a proven track record of quality and safety.” Source: RevenueBase Database · checked Sep 28, 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: electrical 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 electrical systems integrators.
Partial evidence: Its own public description names part of electrical systems integrators, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name electrical 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 25 of 3,480 electrical systems integrators based in the United Kingdom

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Electrical systems integrators based in the United Kingdom at a glance

As of Sep 28, 2026

36.2%Verified-email coverage

7.6Average contacts per company

1-10Median size (employees)

7.9%Largest-city concentration · London

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

2,045

11-50

1,123

51-200

213

201-500

501-1,000

1,001-5,000

10001+

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 3,480 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 electrical 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 the United Kingdom whose own description of what they do matches “electrical 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 electrical 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 electrical systems integrators, 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, 9,557 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 28, 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.

Electrical systems integrators 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 electrical 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 electrical systems integrators are there based in the United Kingdom?

RevenueBase identified 3,480 electrical systems integrators 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?

J Brand LTD, headquartered in London, tops this list with the largest team on record.

Which city has the most electrical systems integrators?

London leads with 276 headquartered companies, followed by Glasgow (42) and Manchester (41).

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 9,557 verified decision-maker contacts tracked across these 3,480 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 28, 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.