Duncan Liddell is a partner and head of our London antitrust, regulatory and trade practice
Duncan is a partner and head of the Antitrust, Regulatory and Trade and EU law department in London and he specialises in contentious and non-contentious UK and EU competition law. Admitted in England & Wales and Ireland, he has considerable experience in advising a wide range of clients on matters before the EU Commission, UK Competition and Markets Authority, UK sectoral regulators (including Ofcom and the FCA), and the UK and European Courts.
Duncan has a very active behavioural practice advising defendants and complainants in relation to contentious and non-contentious matters relating to anti-competitive practices, restrictive practices, cartel behaviour and abuse of a dominant position. He also has a wealth of experience advising on the international merger control aspects of a full range of corporate transaction (mergers, acquisitions, disposals and joint ventures).
Latest thinking
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Quickguides
Competition law investigations by UK authorities
This Quickguide summarises the procedure followed by the Competition and Markets Authority.
12 May 2026
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Quickguides
Dawn raids: dealing with inspections by competition authorities in the UK
08 May 2026
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Quickguides
Competition law investigations by the European Commission
This Quickguide summarises the procedure followed by the European Commission.
06 May 2026
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Quickguides
Overview of UK competition law
This Quickguide provides an overview of UK competition law.
05 May 2026
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Quickguides
Overview of EU competition law
05 May 2026
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Quickguides
EU merger control
This Quickguide provides an overview of the EU merger control regime.
05 May 2026
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Quickguides
UK merger control
This Quickguide summarises the UK merger control regime under the Enterprise Act 2002.
05 May 2026
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Quickguides
The UK criminal cartel offence
05 May 2026
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Quickguides
Dawn raids: dealing with inspections by European competition authorities
05 May 2026
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Quickguides
UK national security and investment control regime
30 Apr 2026
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Legal development
Antitrust, Regulatory & Trade newsletter: your Q1 2026 update
14 Apr 2026
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Legal development
New rules on vertical arrangements in the EU and UK
26 Mar 2026
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Latest news, deals and awards
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News Ashurst advises Treatt on its £183 million recommended takeover by Döhler
29 Apr 2026
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News Ashurst advises Xpansiv on acquisition of Evident Group
07 Nov 2025
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News Ashurst advises Treatt on recommended takeover by Natara
08 Sep 2025
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News Ashurst advises Ricardo on recommended takeover offer from WSP
11 Jun 2025
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News Ashurst advises Sumitomo Corporation on its proposed Danish biogas/PtX/SAF joint venture with Skovgaard Energy
24 Apr 2025
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News Ashurst advises on £70.4 million recommended Takeover of TISE
19 Mar 2025
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News Ashurst advises Basalt Infrastructure Partners on merger of FullFibre and Zzoomm
28 Jan 2025
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News Ashurst advises UB FIGG on its acquisition of FiberLean Technologies Limited
09 Dec 2024
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News Ashurst advises Ashtead Technology on its acquisition of Seatronics and J2
24 Oct 2024
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News Ashurst advises Qair on the acquisition of Green Switch Capital
22 Aug 2024
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News Ashurst advises Vontobel on acquisition of minority stake in Ancala Partners
15 Feb 2024
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