Aidan is an environmental law specialist. He works for clients across many industry sectors, in particular insurance, utilities, real estate, manufacturing, waste management and transport.
His work across these sectors has exposed him to the full range of environmental liability and compliance issues. He has dealt with land and water contamination, air pollution, impacts to nature, waste management and chemical safety. He is an expert on energy efficiency regulation, especially in buildings, and he has a detailed knowledge of the environmental permitting regime in the context of which many of these issues are embedded.
Aidan has provided advice in these areas in a number of different contexts, ranging from administrative law challenges, statutory appeal processes, criminal litigation and civil claims for damages on the one hand, to transactional risk management on the other. Aidan has experience of the defence of class actions for environmental harm and of enforcement/prosecution proceedings by a number of environmental regulators.
As well as dealing with traditional environmental liability and compliance issues, Aidan is involved in related areas of ESG, helping clients to manage the risks and opportunities stemming from new laws around climate change, and embed new behaviours internally and externally.
Aidan has been recommended as a leading environmental law practitioner in the Legal 500 and Chambers directories for over twenty years.
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Aiden has clear, technical knowledge and is an excellent communicator.
Chambers and Partners, 2027 -
Aidan Thomson is very solutions oriented. He's good at turning problems into solutions.
Chambers and Partners, 2027 -
Aiden is somebody that never loses his cool even under immense pressure. He remains objective and not emotional. He has interesting views and unique way of looking at things
Chambers and Partners, 2027 -
Aidan is a well-regarded and reassuring presence within the London environmental market, providing up-to-date knowledge and wording expertise.
Legal 500, 2027 -
Of all the lawyers in our orbit, the Weightmans team of Aidan Thomson and Abhay Srivastava is clearly the most active, ever-present at events, publishing thought leadership, and going far beyond legal services by offering a range of sustainability-related advisory services.
Legal 500, 2027 -
Aidan is very knowledgeable and expert in his field, and is also aware of when other expertise is required. His experience, manner and expertise are exemplary. We always get good advice from Aidan. Aidan provides very technical and detailed analysis and is always aware of the evolving legal and regulatory environment. Aidan Thomson is extremely knowledgeable but also has such a professional manner to his delivery.
Chambers & Partners 2026 -
Aidan Thomson of Weightmans is an experienced practitioner noted for his expertise in environmental insurance matters. He handles both non-contentious and contentious work, frequently advising clients on potential liability arising from corporate and real estate transactions.
Chambers and Partners 2026
