Company lists · Data refreshed September 2026

Top 25 Marine environmental consulting firms based in London, United Kingdom

Name: Marine environmental 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 28, 2026 142 companies tracked

RevenueBase identified 142 marine environmental consulting firms headquartered in London, United Kingdom as of September 2026 and tracks 4,824 professional contacts across them, including 1,099 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers marine environmental 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 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

142Companies

4,824Contacts tracked

1,099Verified emails

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The 25 largest marine environmental consulting firms based in London, United Kingdom

Ranked by team size

Top 25 of 142 marine environmental consulting firms based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to marine environmental 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	ABL	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	1,001-5,000	804 contacts →
	Partial evidence “The Energy and Marine Consultants - an Aqualis company.” Source: RevenueBase Database · checked Sep 28, 2026
2	SDSD	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	n/a	681 contacts →
	Partial evidence “SDSD - Supporting Maritime Professionals since 1983 Software innovation to the Maritime industry for more than 30 years.” Source: RevenueBase Database · checked Sep 28, 2026
3	LOC	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	201-500	206 contacts →
	Indirect evidence “ONE PARTNER.” Source: RevenueBase Database · checked Sep 28, 2026
4	Longitude Engineering	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	138 contacts →
	Indirect evidence “The Engineering Consultants.” Source: RevenueBase Database · checked Sep 28, 2026
5	Drewry Shipping Consultants LTD	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	128 contacts →
	Strong evidence “Drewry is a leading international provider of research and consulting services to the maritime and shipping industry.” Source: RevenueBase Database · checked Sep 28, 2026
6	Mrag LTD	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	103 contacts →
	Indirect evidence “Established in the UK in 1986, MRAG Ltd is a consultancy company dedicated to promoting sustainable use of aquatic resources through sound integrated management policies and…” Source: RevenueBase Database · checked Sep 28, 2026
7	Houlder Limited	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	91 contacts →
	Indirect evidence “Sea.” Source: RevenueBase Database · checked Sep 28, 2026
8	Cares Group	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	48 contacts →
	Strong evidence “We are an international Engineering consultant with a team of over 40 chartered engineers, environmentalists, Maritime experts, and technicians across West Africa, UK, and…” Source: RevenueBase Database · checked Sep 28, 2026
9	Bpp-Tech Cables Renewables	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	35 contacts →
	Partial evidence “BPP-Tech \| Cables \| Renewables provides engineering services to the energy, maritime and defence sectors.” Source: RevenueBase Database · checked Sep 28, 2026
10	Waypoint Global	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	32 contacts →
	Indirect evidence “Waypoint Global operates across Europe, the Americas, the Middle East and Asia providing consultancy services and staffing project solutions to niche vertical markets and in…” Source: RevenueBase Database · checked Sep 28, 2026
11	Braemar Technical Services Marine	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	30 contacts →
	Partial evidence “AqualisBraemar’s Technical Division provides independent technical expertise and analysis to the marine, energy and insurance sectors on a global basis.” Source: RevenueBase Database · checked Sep 28, 2026
12	Solis Marine	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	29 contacts →
	Partial evidence “Solis Marine was established in 2012 to provide independent expert technical services to the shipping and wider maritime industries.” Source: RevenueBase Database · checked Sep 28, 2026
13	Maritime Strategies International	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	28 contacts →
	Partial evidence “From market analysis to investment decision support, Maritime Strategies International (MSI) offers high level, independent market forecasting and business advisory services for…” Source: RevenueBase Database · checked Sep 28, 2026
14	Harland & Wolff	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	1,001-5,000	27 contacts →
	Partial evidence “Building on around 160 years of marine manufacturing experience, Harland & Wolff offers a unique combination of vast facilities and technical capability.” Source: RevenueBase Database · checked Sep 28, 2026
15	TMC Marine	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	22 contacts →
	Partial evidence “TMC, a Bureau Veritas Group Company and leading international marine consultancy, has been providing advice and support to the marine and offshore energy industries since 1979.” Source: RevenueBase Database · checked Sep 28, 2026
16	Hartland Shipping Services Limited	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	17 contacts →
	Partial evidence “Hartland Shipping Services is an experienced, specialised, shipbroking and consulting team with offices in London, Shanghai and Singapore.” Source: RevenueBase Database · checked Sep 28, 2026
17	Independent Maritime Advisors LTD	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	14 contacts →
	Partial evidence “Independent Firm for Maritime Consultancies, IMA Ltd.” Source: RevenueBase Database · checked Sep 28, 2026
18	Thetius	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	13 contacts →
	Partial evidence “Thetius is a research firm that helps maritime industry leaders make strategic technology decisions.” Source: RevenueBase Database · checked Sep 28, 2026
19	Aval Consulting Group	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	13 contacts →
	Indirect evidence “Key Services: Ecology, Air Quality, Flood Risk and Drainage, Transport Planning and Highways, Contaminated Land, Odour, Waste Management, Dust, Lighting Strategy, Daylight and…” Source: RevenueBase Database · checked Sep 28, 2026
20	PAC Ocean Solutions Limited	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	13 contacts →
	Partial evidence “Leading Marine Services Provider, Specializing In Ship Repairs, Maintenance, and Innovative Maritime Solutions.” Source: RevenueBase Database · checked Sep 28, 2026
21	ACP Environmental Consultants	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	11-50	10 contacts →
	Partial evidence “ACP Environmental Consultants provides a wide range of expert environmental services across Greater London, surrounding counties, and up to the Midlands.” Source: RevenueBase Database · checked Sep 28, 2026
22	Intent Communications And Consulting	Strong evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	10 contacts →
	Strong evidence “Intent Communications is a communications, marketing and consulting agency specialising in maritime, offshore, logistics, tech and renewables.” Source: RevenueBase Database · checked Sep 28, 2026
23	Proteus Professionals	Partial evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	10 contacts →
	Partial evidence “Proteus Professionals is comprised of incredibly talented and qualified individuals who are passionate about the marine industry, and who’ve devoted their lives to sailing and…” Source: RevenueBase Database · checked Sep 28, 2026
24	Hanscomb Intercontinental	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	51-200	9 contacts →
	Indirect evidence “Hanscomb Intercontinental are a global provider of expert witness and expert advisory services to the onshore and offshore construction, engineering and shipbuilding industries.” Source: RevenueBase Database · checked Sep 28, 2026
25	A2 Maritime	Indirect evidence	London, United KingdomHQ checked Sep 28, 2026	1-10	8 contacts →
	Indirect evidence “We will not over-promise or under-deliver.” 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: marine environmental 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 marine environmental consulting firms.
Partial evidence: Its own public description names part of marine environmental consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name marine environmental 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 142 marine environmental consulting firms based in London, United Kingdom

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Marine environmental consulting firms based in London, United Kingdom at a glance

As of Sep 28, 2026

22.8%Verified-email coverage

34.0Average contacts per company

1-10Median size (employees)

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

1,001-5,000

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 142 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 marine environmental 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 “marine environmental 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 marine environmental 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 marine environmental 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, 1,099 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.

Marine environmental consulting firms by metro in the United Kingdom

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 marine environmental 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 marine environmental consulting firms are there based in London, United Kingdom?

RevenueBase identified 142 marine environmental 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?

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

Which city in the United Kingdom has the most marine environmental consulting firms?

London leads the United Kingdom with 142 headquartered companies, followed by Southampton (37) and Aberdeen (35).

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 1,099 verified decision-maker contacts tracked across these 142 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.