William was educated at Cambridge and Oxford universities. He joined Slaughter and May in 2006 and became a partner in 2016. He is based in London, but spends a significant amount of his time in Brussels.

William has extensive experience in a wide range of competition and regulatory matters. He has been involved in a number of major cartel and other behavioural cases, including global antitrust investigations. He has also acted on a number of high-profile merger cases before the EU and UK competition authorities. In addition, he has significant experience in the fields of competition litigation and State aid.

Highlights include advising:

  • Deutsche Bank in the context of the multiple investigations into the setting of interbank offered benchmark rates and associated competition litigation
  • Vodafone on the mergers of its Dutch business with that of Liberty Global and its Indian business with that of Idea
  • GE on the disposal of its equipment finance and businesses in France and Germany to Banque Fédérative du Crédit Mutuel
  • Compagnie Financière Richemont on the merger of Net-A-Porter and Yoox
  • Spirit on its takeover by Greene King
  • Essentra on the disposal of its porous technologies business
  • Catlin in relation to its acquisition by XL Group
  • Brit in relation to its acquisition by Fairfax Financial Holdings
  • HM Treasury on competition and State aid aspects of its interventions in relation to Northern Rock and Bradford & Bingley.

William was identified as a ‘future leader’ by Who’s Who Legal: Competition (2017).

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