Company lists · Data refreshed September 2026

Top 25 Electrical testing and diagnostics based in the United Kingdom

Name: Electrical testing and diagnostics 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 1,108 companies tracked

RevenueBase identified 1,108 electrical testing and diagnostics headquartered in the United Kingdom as of September 2026 and tracks 4,378 professional contacts across them, including 920 with verified work emails. London is the largest hub.

This list covers electrical testing and diagnostics 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

1,108Companies

4,378Contacts tracked

920Verified emails

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The 25 largest electrical testing and diagnostics based in the United Kingdom

Ranked by team size

Top 25 of 1,108 electrical testing and diagnostics 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 electrical testing and diagnostics: 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	Guardian Electrical Compliance LTD	Partial evidence	Sheffield, United KingdomHQ checked Sep 19, 2026	51-200	137 contacts →
	Partial evidence “Founded in 2010, Guardian Electrical Compliance Ltd have become the market leaders in terms of Duty Holder guidance, technical & legislative support, site delivery and after sales…” Source: RevenueBase Database · checked Sep 19, 2026
2	Seaward	Strong evidence	Peterlee, United KingdomHQ checked Sep 19, 2026	51-200	83 contacts →
	Strong evidence “With over 75 years’ experience at the cutting edge of electrical safety testing, our expertise and innovations have produced a number of world firsts.” Source: RevenueBase Database · checked Sep 19, 2026
3	AKD	Indirect evidence	Edinburgh, United KingdomHQ checked Sep 19, 2026	51-200	79 contacts →
	Indirect evidence “AKD’s clients get quick results, normally leading to reduced costs and gaining an improved service.” Source: RevenueBase Database · checked Sep 19, 2026
4	Lantei	Strong evidence	Preston, United KingdomHQ checked Sep 19, 2026	51-200	53 contacts →
	Strong evidence “We are the first choice trusted partner, supporting businesses in meeting their regulatory electrical testing requirements.” Source: RevenueBase Database · checked Sep 19, 2026
5	Monitra	Strong evidence	Manchester, United KingdomHQ checked Sep 19, 2026	51-200	51 contacts →
	Strong evidence “Monitra (formerly HVPD) are experts in the field of Partial Discharge (PD) testing and monitoring of Medium Voltage and High Voltage electrical equipment, which can be performed…” Source: RevenueBase Database · checked Sep 19, 2026
6	NES	Partial evidence	Inverness, United KingdomHQ checked Sep 19, 2026	11-50	51 contacts →
	Partial evidence “NES is an Industrial and Commercial Electrical Engineering and Contracting business, based in the North and North East of Scotland.” Source: RevenueBase Database · checked Sep 19, 2026
7	Calbarrie Compliance Services LTD	Partial evidence	Cheltenham, United KingdomHQ checked Sep 19, 2026	51-200	42 contacts →
	Partial evidence “Calbarrie Compliance Services Ltd (Calbarrie) is the UK’s market leader in electrical compliance services and has been trading within the Health & Safety and Compliance sectors…” Source: RevenueBase Database · checked Sep 19, 2026
8	Intersafe Limited	Strong evidence	Southampton, United KingdomHQ checked Sep 19, 2026	11-50	36 contacts →
	Strong evidence “COMPANY OVERVIEW Based near Southampton, Intersafe are compliance specialists providing a range of electrical testing services for large, commercial sites.” Source: RevenueBase Database · checked Sep 19, 2026
9	Sa3 Power	Partial evidence	Cookstown, United KingdomHQ checked Sep 19, 2026	51-200	35 contacts →
	Partial evidence “SA3 Power are a Specialized Electrical Installer that provides electrical services for the Data Centers Industry across Europe.” Source: RevenueBase Database · checked Sep 19, 2026
10	Group Management Electrical Surveys Limited	Partial evidence	Halifax, United KingdomHQ checked Sep 19, 2026	11-50	32 contacts →
	Partial evidence “For the last 25 years, Group Management Electrical Surveys have been providing Electrical Inspection, Test and Documentation services to many of the UK's leading companies.” Source: RevenueBase Database · checked Sep 19, 2026
11	Martindale Electric Co. LTD	Strong evidence	Watford, United KingdomHQ checked Sep 19, 2026	11-50	32 contacts →
	Strong evidence “With over 95 years of experience, Martindale Electric is one of the most trusted brands in electrical safety testing.” Source: RevenueBase Database · checked Sep 19, 2026
12	Ashby Electrical Limited	Strong evidence	Pelsall, United KingdomHQ checked Sep 19, 2026	11-50	30 contacts →
	Strong evidence “Ashby Electrical provide a complete range of electrical design, installation, testing, inspection and maintenance services nationwide.” Source: RevenueBase Database · checked Sep 19, 2026
13	HCM Electrical LTD	Partial evidence	England, United KingdomHQ checked Sep 19, 2026	51-200	29 contacts →
	Partial evidence “HCM Electrical Ltd is a trusted provider of high-quality electrical services, delivering excellence to clients across various industries.” Source: RevenueBase Database · checked Sep 19, 2026
14	Firstfield Electrical LTD	Partial evidence	Ipswich, United KingdomHQ checked Sep 19, 2026	11-50	26 contacts →
	Partial evidence “Firstfield Electrical Ltd are specialists in large-scale industrial and commercial electrical installations, control systems, inspections and domestic works.” Source: RevenueBase Database · checked Sep 19, 2026
15	MD Electrical Contractors LTD	Partial evidence	Glasgow, United KingdomHQ checked Sep 19, 2026	11-50	25 contacts →
	Partial evidence “MD Electrical Contractors specialises in providing top-tier electrical services to a diverse range of clients.” Source: RevenueBase Database · checked Sep 19, 2026
16	Volt Group Scotland LTD	Partial evidence	Glasgow, United KingdomHQ checked Sep 19, 2026	11-50	24 contacts →
	Partial evidence “The Volt Group Scotland Ltd team is made up of the most experienced electrical installers in Scotland.” Source: RevenueBase Database · checked Sep 19, 2026
17	Safety Inspections Group LTD	Partial evidence	Leeds, United KingdomHQ checked Sep 19, 2026	11-50	22 contacts →
	Partial evidence “Safety Inspections Group Ltd specialise in electrical safety for both residential and commercial premises, and was created by the founders of a multi-award winning electrical…” Source: RevenueBase Database · checked Sep 19, 2026
18	Novus Compliance Services Limited	Strong evidence	Bishop Stortford, United KingdomHQ checked Sep 19, 2026	51-200	21 contacts →
	Strong evidence “At Novus Compliance Services Ltd we specialise in Electrical Testing and Inspection, Maintenance, Installation design, Energy Management and refurbishment for a wide range of…” Source: RevenueBase Database · checked Sep 19, 2026
19	RNM Electrical Limited	Partial evidence	Bolton, United KingdomHQ checked Sep 19, 2026	51-200	21 contacts →
	Partial evidence “RNM ELECTRICAL LIMITED is a construction company based out of 10 THE HILLOCK THE HILLOCK, BOLTON, United Kingdom.” Source: RevenueBase Database · checked Sep 19, 2026
20	EML Electrical Contractors LTD	Partial evidence	Peterborough, United KingdomHQ checked Sep 19, 2026	11-50	21 contacts →
	Partial evidence “Here at EML Electrical we pride ourselves on providing quality installations at a competitive price.” Source: RevenueBase Database · checked Sep 19, 2026
21	HK Engineering LTD	Strong evidence	Melksham, United KingdomHQ checked Sep 19, 2026	11-50	20 contacts →
	Strong evidence “HK Engineering Ltd is a leading engineering company specialising in electrical and gas testing and innovative solutions, with a solid commitment to excellence.” Source: RevenueBase Database · checked Sep 19, 2026
22	ATE Solutions LTD	Strong evidence	Blisworth, United KingdomHQ checked Sep 19, 2026	11-50	17 contacts →
	Strong evidence “We are the UK’s leading provider of automated testing solutions for electronic and electrical products.” Source: RevenueBase Database · checked Sep 19, 2026
23	LUX Property Services	Partial evidence	Hoddesdon, United KingdomHQ checked Sep 19, 2026	51-200	17 contacts →
	Partial evidence “Since 2012, Lux have been providing electrical services to a variety of clients.” Source: RevenueBase Database · checked Sep 19, 2026
24	Spin UK Limited	Indirect evidence	Worcester, United KingdomHQ checked Sep 19, 2026	11-50	16 contacts →
	Indirect evidence “Founded in Spin UK Ltd was the second company in the Spin Group.” Source: RevenueBase Database · checked Sep 19, 2026
25	T James Electrical	Partial evidence	Kettering, United KingdomHQ checked Sep 19, 2026	11-50	16 contacts →
	Partial evidence “With nearly 60 years' of experience, T James Electrical Ltd is one of the most respected and well established electrical contractors in the East Midlands.” 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: electrical testing and diagnostics. 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 testing and diagnostics.
Partial evidence: Its own public description names part of electrical testing and diagnostics, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name electrical testing and diagnostics. 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 1,108 electrical testing and diagnostics based in the United Kingdom

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Electrical testing and diagnostics based in the United Kingdom at a glance

As of Sep 19, 2026

21.0%Verified-email coverage

4.0Average contacts per company

1-10Median size (employees)

6.9%Largest-city concentration · London

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

788

11-50

247

51-200

1,001-5,000

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 1,108 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 testing and diagnostics, 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 testing and diagnostics”. 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 testing and diagnostics), 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 testing and diagnostics, 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, 920 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.

Electrical testing and diagnostics by metro

Electrical testing and diagnostics in London76

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 testing and diagnostics, 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 testing and diagnostics are there based in the United Kingdom?

RevenueBase identified 1,108 electrical testing and diagnostics 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?

Guardian Electrical Compliance LTD, headquartered in Sheffield, tops this list with the largest team on record.

Which city has the most electrical testing and diagnostics?

London leads with 76 headquartered companies, followed by Manchester (18) and Leicester (16).

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 920 verified decision-maker contacts tracked across these 1,108 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.