Company lists · Data refreshed September 2026

Top 24 System architecture consulting firms based in London, United Kingdom

Name: System architecture 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 29, 2026 580 companies tracked

RevenueBase identified 580 system architecture consulting firms headquartered in London, United Kingdom as of September 2026 and tracks 4,621 professional contacts across them, including 1,486 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers system architecture 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 29, 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 29, 2026 86% judged on-target in blind review

580Companies

4,621Contacts tracked

1,486Verified emails

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The 24 largest system architecture consulting firms based in London, United Kingdom

Ranked by team size

Top 24 of 580 system architecture consulting firms based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to system architecture 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	Zenzero	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	501-1,000	401 contacts →
	Indirect evidence “We believe successful businesses are underpinned by quality IT infrastructure.” Source: RevenueBase Database · checked Sep 29, 2026
2	Glue Reply	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	118 contacts →
	Indirect evidence “WHO WE ARE Glue Reply is a business consultancy that strives to help its clients achieve their future potential by developing solutions that often for the first time align IT…” Source: RevenueBase Database · checked Sep 29, 2026
3	Constor Solutions	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	87 contacts →
	Indirect evidence “At Constor Solutions, we believe that technology is the backbone of a successful business.” Source: RevenueBase Database · checked Sep 29, 2026
4	Principle ONE	Strong evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	78 contacts →
	Strong evidence “Principle One provides Systems Engineering, Architecture and Business Consulting services within the Law Enforcement, National Security, Health and wider public sector.” Source: RevenueBase Database · checked Sep 29, 2026
5	Baseel Partners	Partial evidence	London, United KingdomHQ checked Sep 29, 2026	1,001-5,000	78 contacts →
	Partial evidence “We offer a broad portfolio of IT and consulting services covering Governance and Strategy, Cloud, Data, Cybersecurity, Infrastructure and Applications, Managed IT and Security.” Source: RevenueBase Database · checked Sep 29, 2026
6	6point6 Part Of Accenture	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	201-500	68 contacts →
	Indirect evidence “6point6 drives the right change in an organisation through the positive impact of technology.” Source: RevenueBase Database · checked Sep 29, 2026
7	Ziipline	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	59 contacts →
	Indirect evidence “We’re people-first and culture-obsessed.” Source: RevenueBase Database · checked Sep 29, 2026
8	FMK	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	n/a	59 contacts →
	Indirect evidence “A full service consultancy company specialising integrating Macintosh and Windows.” Source: RevenueBase Database · checked Sep 29, 2026
9	Marionete	Partial evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	53 contacts →
	Partial evidence “Marionete is a technology consulting firm that empowers organizations to design innovative data strategies, drive digital transformation, and build advanced digital platforms.” Source: RevenueBase Database · checked Sep 29, 2026
10	Onepoint Consulting	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	52 contacts →
	Indirect evidence “We build digital worlds with our collaborators to ensure all the worlds we live in reap the benefits.” Source: RevenueBase Database · checked Sep 29, 2026
11	Marx Enterprise Transformation Architecture	Partial evidence	London, United KingdomHQ checked Sep 29, 2026	501-1,000	49 contacts →
	Partial evidence “Marx Group is a leading global AI fueled Solutions & Products firm with a solid framework of Enterprise Architecture as Service to master rapid changes.” Source: RevenueBase Database · checked Sep 29, 2026
12	Pace Integration	Strong evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	47 contacts →
	Strong evidence “Pace Integration is a unique technology consultancy that solves your integration challenge – focused on enterprise systems integration strategy, architecture and design that is…” Source: RevenueBase Database · checked Sep 29, 2026
13	Sheehan Nagle Hartray Associates, LTD A Woolpert Company	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	37 contacts →
	Indirect evidence “Sheehan Nagle Hartray Associates, Ltd.” Source: RevenueBase Database · checked Sep 29, 2026
14	BDG Architecture Design	Partial evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	37 contacts →
	Partial evidence “BDG architecture + design is an international consultancy focusing on strategy, architecture and design for corporate, public sector and education clients for new build…” Source: RevenueBase Database · checked Sep 29, 2026
15	Decision Inc. UK	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	201-500	35 contacts →
	Indirect evidence “Decision Inc.” Source: RevenueBase Database · checked Sep 29, 2026
16	ECS Systems LTD	Partial evidence	London, United KingdomHQ checked Sep 29, 2026	11-50	35 contacts →
	Partial evidence “Here at ECS Systems we pride ourselves on providing the highest level of personalised service, to every client.” Source: RevenueBase Database · checked Sep 29, 2026
17	HP Infosystem, LLC	Partial evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	35 contacts →
	Partial evidence “HP Infosystem is a comprehensive consulting and IT Services provider of absolute tech-business solutions having strong expertise and extensive technical skills with global…” Source: RevenueBase Database · checked Sep 29, 2026
18	Tiberone	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	33 contacts →
	Indirect evidence “At Tiberone, we specialize in solving corporate IT problems by designing, building, and supporting solutions that drive results.” Source: RevenueBase Database · checked Sep 29, 2026
19	MIX Consultancy LTD	Indirect evidence	London, United KingdomHQ checked Sep 29, 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 29, 2026
20	PPA Phillipspage Associates	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	31 contacts →
	Indirect evidence “Formed in 2008 PPA is a specialist Mission Critical Solutions consultancy delivering turnkey Data Centre solutions including Mechanical, Electrical, Public Health, ICT and…” Source: RevenueBase Database · checked Sep 29, 2026
21	Maple Networks	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	11-50	30 contacts →
	Indirect evidence “We’re the team that the IT leaders of tech-dependant organisations come to when they need to really shake things up, innovate (effectively), and tackle their transformational…” Source: RevenueBase Database · checked Sep 29, 2026
22	The S&a Transform Group	Strong evidence	London, United KingdomHQ checked Sep 29, 2026	201-500	27 contacts →
	Strong evidence “Established in 2009, The S&A Transform Group,(formerly known as The Strategy & Architecture Group) is a leading provider of Business, Technology & Digital Consulting, Solutions…” Source: RevenueBase Database · checked Sep 29, 2026
23	Technology Transformation Group	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	11-50	26 contacts →
	Indirect evidence “Every business is unique in its setup, processes, and goals.” Source: RevenueBase Database · checked Sep 29, 2026
24	JP Reis	Indirect evidence	London, United KingdomHQ checked Sep 29, 2026	51-200	26 contacts →
	Indirect evidence “JP Reis helps financial trading organizations make better technology decisions and deliver complex transformation programs with confidence.” Source: RevenueBase Database · checked Sep 29, 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: system architecture 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 system architecture consulting firms.
Partial evidence: Its own public description names part of system architecture consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name system architecture 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 24 of 580 system architecture consulting firms based in London, United Kingdom

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System architecture consulting firms based in London, United Kingdom at a glance

As of Sep 29, 2026

32.2%Verified-email coverage

8.0Average contacts per company

1-10Median size (employees)

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

389

11-50

135

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured across the whole United Kingdom list rather than for London, so it is reported there. Company counts and contact totals on this page are exact for London, over 580 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 system architecture 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 “system architecture 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 system architecture 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 system architecture 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, 1,486 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 29, 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.

System architecture consulting firms by metro in the United Kingdom

System architecture consulting firms in Manchester33

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 system architecture 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 system architecture consulting firms are there based in London, United Kingdom?

RevenueBase identified 580 system architecture 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?

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

Which city in the United Kingdom has the most system architecture consulting firms?

London leads the United Kingdom with 580 headquartered companies, followed by Manchester (33) and Bristol (24).

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 1,486 verified decision-maker contacts tracked across these 580 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 29, 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.