Portrait of Leon Fields

Leon Fields : Senior Consultant

Leon’s areas of expertise include market design, competition policy and the economic regulation of utilities. He is a member of the Regulation and Water teams at Oxera, and has particular expertise in incentive regulation, behavioural economics and industrial organisation. He is a member of Oxera’s Content Hub, and has been actively involved in Oxera’s Agenda publication since its launch.

Leon has in-depth knowledge of the water sector, having been actively involved in all aspects of the 1999, 2004, 2009, 2014, 2019 and 2024 periodic reviews. Across utility sectors, he has detailed knowledge of incentive regulation, regulatory reform and market reform. He has worked for several small-island jurisdictions on regulatory change.

Leon has also undertaken a number of projects on consumer behaviour, firm behaviour and market design. He is an expert in water tariff design, and in how the objectives of cost recovery, efficiency and compliance can be balanced. He has also undertaken water infrastructure option appraisal for a variety of clients.

Leon speaks English.

Tel: +44 (0) 1865 253014

Leon's specialisms include:

professional experience

  • Project managing a team advising South West Water on various PR24 regulation issues (2020–)

  • Led and provided economic regulation training to South West Water (2020–23)

  • Expert adviser on the economics of renewals for a European transport organisation (2023)

  • Advice to the Home Office on introducing a charge control for emergency mobile radio network services (2022–23)

  • Project managed the Oxera team in the Pennon–Bristol CMA merger inquiry, including in relation to performance commitments (2021–22)

  • Project manager in exploring the role of benchmarking for a European transport organisation (2021)


  • Niels, G., Dijk, R. van and Fields, L. (2013), ‘Behavioural economics and its impact on competition policy: A practical assessment’, Competition Law Journal, 12:3, pp. 374–84.

  • Fields, L., Horncastle, A. and Noble, R. (2009), ‘Water competition and the Cave Review: a clear way forward?’, Competition Law Journal, 8:3, pp. 238–47.


  • MSc Economics, University of Warwick

  • BSc Economics, University of Warwick

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