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Gwion Lewis was called to the Bar in 2005 and specialises in public, planning, environmental, EU and public international law. He was “the most active barrister” at the junior Bar in 2016, measured by case days in the English courts (The Lawyer Court Rankings, 2016). Gwion is recommended as a leading junior in both of the main independent legal directories:

Chambers & Partners UK

  • “He makes complicated cases look straightforward despite difficult points.” (Planning, 2018)
  • “He is a pleasure to work with and immensely collaborative. He creates a team feel.” (Environment, 2018)
  • “He possesses real mastery of the detail on very technical issues, and is a confident and effective advocate.” (Planning, 2018)
  • "Provides excellent advice and is approachable. We have great confidence in him." (Planning, 2017)
  • "He picks up technical details very quickly and thoroughly, and is very good on his feet."(Environment, 2017)
  • "The extent of the detail and the effort he puts in is fantastic." (Administrative & Public, 2016)
  • "He is an intelligent and able barrister and is easy to deal with." (Planning, 2016)
  • "His pleadings are extremely effective." (Administrative & Public, 2015)
  • "He has a good manner with clients, listens to what others say and is a fearsome cross-examiner." (Administrative & Public, 2015)

Legal 500

  • “Very user-friendly and easy to work with.” (Planning, Environment, 2017)
  • “An impressive barrister with a growing reputation.” (Administrative & Public, 2017)
  • "Intellectually very capable and confident for someone of his call." (Administrative & Public, 2016)
  • "He grasps technical details very quickly and is very well prepared." (Planning, 2016)
  • "A top-class advocate; he has a good manner and is quick on his feet." (Administrative & Public, 2015)
  • "He is excellent at picking up difficult technical issues quickly." (Planning, 2015)
  • "Inspires confidence." (Planning, 2014)

Who's Who Legal

  • "[He] instils confidence in his clients thanks to his high level expertise." (Environment, 2018)
  • "Gwion never fails to impress with his ability to produce high-quality and succinct arguments designed to win in a very short time frame." (Environment, 2018)

Gwion is a member of the Attorney General's 'A' Panel of Junior Counsel, which means that he regularly acts for the UK Government in its most complex cases. Gwion is also a member of the Welsh Government's ‘A’ Panel of Junior Counsel. He acts regularly for both public and private sector clients at inquiries and has extensive experience of judicial review proceedings and appeals in the higher courts. To date, he has appeared in over 120 inquiries and over 100 substantive judicial reviews. Gwion welcomes instructions from all areas of the UK and from international clients. He has experience of advising clients in island jurisdictions, including the Isle of Man and the Channel Islands.

For more details about Gwion’s particular areas of expertise, please click on the links below:

Gwion is the editor of the ‘Wales’ section of the Planning Encyclopedia and he speaks regularly about legal affairs on television and radio. In 2013, he received the BAFTA Wales award for ‘Best Breakthrough’ for his television work. Recent broadcasting work includes writing and presenting critically-acclaimed documentaries on Brexit and the future of public service broadcasting for BBC Radio Cymru, and two series of Siarad o Brofiad (‘Speaking from Experience’), in which Gwion interviews prominent figures in Welsh public life on television for S4C.

View Gwion's profile on our International site