Company lists · Data refreshed September 2026

Top 25 Gdpr compliance consulting firms based in London, United Kingdom

Name: Gdpr compliance consulting firms based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 12, 2026 85 companies tracked

RevenueBase identified 85 gdpr compliance consulting firms headquartered in London, United Kingdom as of September 2026 and tracks 509 professional contacts across them, including 201 with verified work emails and 19 with mobile numbers. Across the United Kingdom, London is the largest hub for this category.

This list covers gdpr compliance consulting firms 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 12, 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 12, 2026 86% judged on-target in blind review

85Companies

509Contacts tracked

201Verified emails

19Mobile numbers

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The 25 largest gdpr compliance consulting firms based in London, United Kingdom

Ranked by team size

Top 25 of 85 gdpr compliance consulting firms based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 12, 2026. RevenueBase Smart Search rates how each company's information relates to gdpr compliance consulting firms: 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	Hewardmills	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	46 contacts →
	Indirect evidence “HewardMills provides regulatory advice and other specialist Data Protection Officer (DPO) services to multinational organisations.” Source: RevenueBase Database · checked Sep 12, 2026
2	Seers AI	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	36 contacts →
	Indirect evidence “Seers is an AI-driven consent management platform that empowers businesses to meet global data privacy requirements with confidence and ease.” Source: RevenueBase Database · checked Sep 12, 2026
3	Securys Limited	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	28 contacts →
	Indirect evidence “We believe privacy matters because people matter.” Source: RevenueBase Database · checked Sep 12, 2026
4	Privacy Culture	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	28 contacts →
	Indirect evidence “Privacy Culture helps organisations build trust through expert privacy services supported by powerful technology.” Source: RevenueBase Database · checked Sep 12, 2026
5	LEX Dinamica	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	17 contacts →
	Partial evidence “Lex Dinamica is a consulting firm that provides Privacy, AI and Risk solutions.” Source: RevenueBase Database · checked Sep 12, 2026
6	IGS Information Governance Services	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	15 contacts →
	Indirect evidence “We are a specialist data protection and data ethics consultancy firm with an expert team of lawyers, consultants and advisors who provide a wide range of data privacy, data…” Source: RevenueBase Database · checked Sep 12, 2026
7	Kazient Privacy Experts Data Protection Made Easy Peasy	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	1-10	13 contacts →
	Partial evidence “At Kazient Privacy Experts, our Privacy, Data Protection and GDPR consultants offer cutting edge, practical and effective solutions for all your privacy and data protection…” Source: RevenueBase Database · checked Sep 12, 2026
8	Data Privacy Manager	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	51-200	11 contacts →
	Indirect evidence “Data Privacy Manager is a comprehensive privacy solution for personal data management, set out to protect digital privacy and help Organizations comply with data protection laws…” Source: RevenueBase Database · checked Sep 12, 2026
9	Trust Keith Your Always-On Privacy Partner	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	10 contacts →
	Indirect evidence “Trust Keith is the global Privacy Management solution for data-centric SMBs with big ambitions.” Source: RevenueBase Database · checked Sep 12, 2026
10	Privacy Partnership	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	10 contacts →
	Indirect evidence “Data Protection and Privacy Law firm, Training and Consultancy.” Source: RevenueBase Database · checked Sep 12, 2026
11	Hellodpo	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	1-10	8 contacts →
	Indirect evidence “We are an innovative data protection law firm offering legal data protection advice, outsourced DPO services and data protection training.” Source: RevenueBase Database · checked Sep 12, 2026
12	Ig-Smart LTD	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	5 contacts →
	Indirect evidence “Business Overview Established in 2009, IG-Smart Ltd is a pioneering force in the realm of data privacy, security, and digital technology consultancy.” Source: RevenueBase Database · checked Sep 12, 2026
13	Privinotch	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	1-10	5 contacts →
	Indirect evidence “PRIVINOTCH is a UK-based consultancy specialising in AI governance and data privacy across the NA, EMEA, and LATAM regions.” Source: RevenueBase Database · checked Sep 12, 2026
14	Cynance	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	4 contacts →
	Partial evidence “Cynance is a business-driven cybersecurity and data protection consulting and Cyber tech reselling firm, trusted by organizations across the UK, EU, and worldwide.” Source: RevenueBase Database · checked Sep 12, 2026
15	Iron Carrot Limited	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	1-10	3 contacts →
	Indirect evidence “Specialists in helping modern, innovative law firms to deliver a robust data governance roadmap that helps them assure and accelerate their most critical data-driven initiatives.” Source: RevenueBase Database · checked Sep 12, 2026
16	Data Protection Network Associates	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	1-10	3 contacts →
	Indirect evidence “Our experienced team provides down-to-earth data protection advice, support and training.” Source: RevenueBase Database · checked Sep 12, 2026
17	Emma Gross Employment Solicitor	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	51-200	2 contacts →
	Indirect evidence “Emma Gross is a Partner Solicitor at Spencer West.” Source: RevenueBase Database · checked Sep 12, 2026
18	Tacita	Strong evidence	London, United KingdomHQ checked Sep 12, 2026	11-50	2 contacts →
	Strong evidence “A low disruption, low cost, GDPR assessment service that determines your current compliance level.” Source: RevenueBase Database · checked Sep 12, 2026
19	Onteigo	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	1-10	2 contacts →
	Partial evidence “Onteigo is the global data protection compliance partner for data-driven startups and scaleups.” Source: RevenueBase Database · checked Sep 12, 2026
20	Assenteo	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	1-10	2 contacts →
	Partial evidence “Assenteo is a data protection and AI governance platform that helps customer-first, b2b AI companies embed trust into their products, through expert-led compliance.” Source: RevenueBase Database · checked Sep 12, 2026
21	Infinitic Consultancy LTD	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	1-10	1 contacts →
	Indirect evidence “We are professional information governance consultants with a combination of both hard and soft skills in information governance and data protection regulations.” Source: RevenueBase Database · checked Sep 12, 2026
22	The Privacy Consultancy Limited	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	1-10	1 contacts →
	Partial evidence “Let Privacy be a Business enabler not a Business restrictor’ First the GDPR, now for Individuals and Companies in the UK we have the UK Data Protection Act 2018 – further…” Source: RevenueBase Database · checked Sep 12, 2026
23	The Data Guardians	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	1-10	1 contacts →
	Indirect evidence “The Data Guardians exist to enable organisations to comply with data protection regulations as well as to extract maximum value from data.” Source: RevenueBase Database · checked Sep 12, 2026
24	ARC Data LTD	Indirect evidence	London, United KingdomHQ checked Sep 12, 2026	1-10	1 contacts →
	Indirect evidence “At Arc we’re all about data and the insight it holds, and we’re passionate about helping organisations make smarter and more responsible use of data.” Source: RevenueBase Database · checked Sep 12, 2026
25	Data Protection 4 Business Limited	Partial evidence	London, United KingdomHQ checked Sep 12, 2026	1-10	1 contacts →
	Partial evidence “Through our network of Trusted Partners, Data Protection 4 Business provides a full range of compliance services from Legal advice, Information Security assessments, Data…” Source: RevenueBase Database · checked Sep 12, 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: gdpr compliance consulting firms. 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 gdpr compliance consulting firms.
Partial evidence: Its own public description names part of gdpr compliance consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name gdpr compliance consulting firms. 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 85 gdpr compliance consulting firms based in London, United Kingdom

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Gdpr compliance consulting firms based in London, United Kingdom at a glance

As of Sep 12, 2026

39.5%Verified-email coverage

3.7%Mobile-number coverage

6.0Average contacts per company

1-10Median size (employees)

Sep 12, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

Freshness & accuracy

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

Email last verified

Median 14.0d

1660–30

3131–60

161–90

190–180

2180+

Company record updated

Median 64.0d

00–30

22031–60

20061–90

5490–180

35180+

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 gdpr compliance consulting firms, 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 “gdpr compliance consulting firms”. 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 gdpr compliance consulting firms), 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 gdpr compliance consulting firms, 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, 201 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 12, 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.

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 gdpr compliance consulting firms, 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 gdpr compliance consulting firms are there based in London, United Kingdom?

RevenueBase identified 85 gdpr compliance consulting firms 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?

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

Which city in the United Kingdom has the most gdpr compliance consulting firms?

London leads the United Kingdom with 95 headquartered companies, followed by Manchester (7) and Southampton (5).

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 201 verified decision-maker contacts tracked across these 85 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 12, 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.