Company lists · Data refreshed September 2026

Top 25 Critical infrastructure protection services based in the United Kingdom

Name: Critical infrastructure protection services 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 426 companies tracked

RevenueBase identified 426 critical infrastructure protection services headquartered in the United Kingdom as of September 2026 and tracks 3,375 professional contacts across them, including 736 with verified work emails. London is the largest hub.

This list covers critical infrastructure protection services 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

426Companies

3,375Contacts tracked

736Verified emails

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The 25 largest critical infrastructure protection services based in the United Kingdom

Ranked by team size

Top 25 of 426 critical infrastructure protection services 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 critical infrastructure protection services: 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	Pilgrims Risk Management Group	Indirect evidence	Woking, United KingdomHQ checked Sep 19, 2026	201-500	205 contacts →
	Indirect evidence “Pilgrims are a global security, risk management and service support company that identifies and manages risks for clients across all sectors, including oil & gas, telecoms…” Source: RevenueBase Database · checked Sep 19, 2026
2	Cyberfort	Partial evidence	Thatcham, United KingdomHQ checked Sep 19, 2026	51-200	159 contacts →
	Partial evidence “At Cyberfort we are passionate about the cyber security services we deliver for our customers which keeps their people, data, systems and technology infrastructure secure…” Source: RevenueBase Database · checked Sep 19, 2026
3	SF Group	Indirect evidence	Nottingham, United KingdomHQ checked Sep 19, 2026	201-500	143 contacts →
	Indirect evidence “SF Group are your local knowledge experts in risk management, security, logistics and emergency solution support.” Source: RevenueBase Database · checked Sep 19, 2026
4	Trpglobal	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	126 contacts →
	Indirect evidence “We are TRPGLOBAL, your strategic partner in helping you with the complexities of risk management.” Source: RevenueBase Database · checked Sep 19, 2026
5	Solace Global	Indirect evidence	Poole, United KingdomHQ checked Sep 19, 2026	201-500	115 contacts →
	Indirect evidence “Solace Global Risk began in 2010 with a simple belief: when people face risk, they need partners who act quickly and stand by their word.” Source: RevenueBase Database · checked Sep 19, 2026
6	AKE International	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	89 contacts →
	Indirect evidence “We are proud of our unique track record.” Source: RevenueBase Database · checked Sep 19, 2026
7	Minimal Risk Consultancy Limited	Indirect evidence	Hereford., United KingdomHQ checked Sep 19, 2026	51-200	79 contacts →
	Indirect evidence “Minimal Risk Consultancy is an Independent Security Services, Specialist Consultancy and Recruitment business with current expertise in:> Security Risk Consultancy > Security…” Source: RevenueBase Database · checked Sep 19, 2026
8	Peregrine Risk Management	Indirect evidence	Plymouth, United KingdomHQ checked Sep 19, 2026	201-500	79 contacts →
	Indirect evidence “Peregrine Risk Management is a leading provider of physical security, risk consultancy, travel risk management, security intelligence, and specialist training services.” Source: RevenueBase Database · checked Sep 19, 2026
9	Esmart Networks	Indirect evidence	Braintree, United KingdomHQ checked Sep 19, 2026	51-200	75 contacts →
	Indirect evidence “Securing your power needs to deliver your electrification plans with certainty.” Source: RevenueBase Database · checked Sep 19, 2026
10	Assist Security Group	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	58 contacts →
	Indirect evidence “Assist Security Group (ASG) helps clients build resilient, comprehensive security strategies that protect their people and assets, business continuity and reputation.” Source: RevenueBase Database · checked Sep 19, 2026
11	Black Diamond Security	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	201-500	58 contacts →
	Indirect evidence “Black Diamond Security - Safeguarding Your World.” Source: RevenueBase Database · checked Sep 19, 2026
12	SQR Group Security Solutions LTD	Strong evidence	Barnet, United KingdomHQ checked Sep 19, 2026	501-1,000	58 contacts →
	Strong evidence “In today’s advanced, interconnected world, protecting the infrastructure that allows society to function is crucial.” Source: RevenueBase Database · checked Sep 19, 2026
13	Frankton Group LTD	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	48 contacts →
	Indirect evidence “In today’s complex threat environment, businesses, individuals, and organisations require trusted partners to provide the ultimate assurance that their assets are well protected.” Source: RevenueBase Database · checked Sep 19, 2026
14	Cornerstone	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	44 contacts →
	Indirect evidence “CornerStone is an award winning, independent, security and digital building consulting firm with headquarters in the UK.” Source: RevenueBase Database · checked Sep 19, 2026
15	Audere Group	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	37 contacts →
	Indirect evidence “Audere Group is a London-headquartered holistic risk advisory company founded in 2014.” Source: RevenueBase Database · checked Sep 19, 2026
16	Barrier Networks	Strong evidence	Glasgow, United KingdomHQ checked Sep 19, 2026	11-50	34 contacts →
	Strong evidence “We are your strategic cybersecurity partner – going beyond traditional models to deliver agile, expert-led protection tailored to the needs of regulated industries and critical…” Source: RevenueBase Database · checked Sep 19, 2026
17	EOS Risk Group	Indirect evidence	United KingdomHQ checked Sep 19, 2026	11-50	34 contacts →
	Indirect evidence “EOS Risk Group is a UK-based corporate and private client security risk and crisis management practice, operating globally.” Source: RevenueBase Database · checked Sep 19, 2026
18	Othrys	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	33 contacts →
	Indirect evidence “Othrys is a global strategic and risk advisory firm founded in 2016.” Source: RevenueBase Database · checked Sep 19, 2026
19	Secur-It Group	Partial evidence	Mansfield, United KingdomHQ checked Sep 19, 2026	201-500	29 contacts →
	Partial evidence “Secur-it Group is a leading provider of nationwide security services, fire protection and risk mitigation.” Source: RevenueBase Database · checked Sep 19, 2026
20	Priavo Security	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	28 contacts →
	Indirect evidence “Priavo Security Group is an established provider of comprehensive security risk management, dedicated to safeguarding individuals, information, assets, and reputation through…” Source: RevenueBase Database · checked Sep 19, 2026
21	Circle UK Group LTD	Indirect evidence	Cheshunt, United KingdomHQ checked Sep 19, 2026	51-200	27 contacts →
	Indirect evidence “We are a strategic partner in risk management, helping businesses protect their people, property and performance through integrated security, compliance, safety and operational…” Source: RevenueBase Database · checked Sep 19, 2026
22	Tekgem	Indirect evidence	Sedgefield, United KingdomHQ checked Sep 19, 2026	11-50	26 contacts →
	Indirect evidence “Tekgem bridges the gap between Information Technology (IT) and Operational Technology (OT).” Source: RevenueBase Database · checked Sep 19, 2026
23	Henderson Risk Group	Indirect evidence	City Of London, United KingdomHQ checked Sep 19, 2026	501-1,000	25 contacts →
	Indirect evidence “We are an established business risk management company approaching 20 years of service to our clients.” Source: RevenueBase Database · checked Sep 19, 2026
24	Sangfroid Group	Indirect evidence	Exeter, United KingdomHQ checked Sep 19, 2026	11-50	25 contacts →
	Indirect evidence “Sangfroid Group is a UK registered company with its Head Office in Southwest England.” Source: RevenueBase Database · checked Sep 19, 2026
25	Se24	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	24 contacts →
	Indirect evidence “A core member of the Chelsea Group Security & Crisis Management Division, Security Exchange is dedicated to the provision of specialist consultancy on a worldwide basis…” 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: critical infrastructure protection services. 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 critical infrastructure protection services.
Partial evidence: Its own public description names part of critical infrastructure protection services, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name critical infrastructure protection services. 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 426 critical infrastructure protection services based in the United Kingdom

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Critical infrastructure protection services based in the United Kingdom at a glance

As of Sep 19, 2026

21.8%Verified-email coverage

7.9Average contacts per company

1-10Median size (employees)

35.2%Largest-city concentration · London

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

263

11-50

105

51-200

201-500

501-1,000

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 426 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 critical infrastructure protection services, 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 “critical infrastructure protection services”. 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 critical infrastructure protection services), 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 critical infrastructure protection services, 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, 736 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.

Critical infrastructure protection services by metro

Critical infrastructure protection services in London150

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 critical infrastructure protection services, 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 critical infrastructure protection services are there based in the United Kingdom?

RevenueBase identified 426 critical infrastructure protection services 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?

Pilgrims Risk Management Group, headquartered in Woking, tops this list with the largest team on record.

Which city has the most critical infrastructure protection services?

London leads with 150 headquartered companies, followed by Manchester (9) and Edinburgh (6).

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 736 verified decision-maker contacts tracked across these 426 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.