Our Directors

Lisa Clement

Lisa was appointed as an independent non-executive director in January 2023 and is chair of the audit and risk committee. On 30 April 2026, Lisa also assumed the position as Interim Independent Non-Executive Chair. During her executive career, Lisa worked across a wide range of sectors for companies ranging from multi-billion-pound UK and US main-market listed global conglomerates to start-up private equity-backed SMEs. Her roles included being Chief Financial Officer for Sea Containers Ltd. Subsequently she was a non-executive director and chair of the audit committee for U.K. Coal PLC during its restructure and reorganisation into Harworth Group PLC, where she also chaired the audit committee, then later chaired the remuneration committee and was senior independent director. She was previously a non-executive director and chair of the remuneration committee for Light Science Technologies Holdings PLC. Lisa is a Chartered Accountant and graduate of Oxford University.

Célia Pronto

Célia was appointed as an independent non-executive director on 1 June 2018 and is chair of the remuneration committee. On 30 April 2026, Célia also assumed the position as Interim chair of the nomination committee. Célia has previously held a range of senior executive roles and has a wealth of experience and transformation expertise in a range of customer-led industries. Célia is a non-executive director of Samworth Brothers (Holdings) Ltd and Direct Wines Limited and Direct Wines Holdings Limited, where she chairs the People Committee. She is a non-executive director of Everest UK Bidco Limited (a Jersey registered company), where she chairs the risk & audit committee. As part of normal board rotation, her tenure as a non-executive director of Campden BRI, where she chaired the remuneration & audit & risk committees in turn, has recently ended. Célia is the founder and director of Impact Ventures Group Limited. She was previously a non-executive director at Hostmore plc (dissolved). Célia holds a Bachelor of Commerce undergraduate degree and an MBA.

Caroline Sheridan

Caroline was appointed as a non-executive director on 12 February 2025. A Chartered Civil Engineer, Caroline brings 30 years of diverse experience in asset investment, engineering, and capital delivery. Her extensive career spans critical infrastructure at Heathrow Airport, Transport for London (leading capital investment and asset strategy across the network), and Thames Water Utilities, where she was Engineering and Asset Director. Since March 2026, Caroline has had an executive role in a leading UK organisation delivering its capital programme and transformation. Caroline has also advised within the water, rail, and nuclear sectors and until September 2025, she was a director at the Construction Industry Research and Information Association (CIRIA). Caroline holds a MEng in civil engineering from the University of Leeds and is a chartered member of ICE.

Mark McArdle

Mark was appointed as a non-executive director on 9 February 2022. Mark has over 15 years of experience in investment management, corporate governance, transaction advisory and corporate finance across the energy & renewables, regulated utilities and healthcare sectors in both Europe and Australasia. Since joining Morrison in 2020, Mark has led investments in the healthcare and energy sectors and held directorships across both electricity transmission, water utility, renewable development and operational renewable assets. Prior to joining the firm, Mark was an investment professional in the Queensland Investment Corporation’s (QIC) Global Infrastructure business, focused on the social infrastructure, utilities and renewable sectors. Prior to QIC, Mark spent five years in M&A and financing roles within the utilities and renewable sectors at RBC Capital Markets in both London and Sydney. Mark holds a Master of Chemistry from the University of Oxford.

Michael McKinstry

Michael was appointed as a non-executive director on 15 August 2024. With over 35 years’ experience, he acts as senior adviser to Vantage Infrastructure Group (part of the Capital Four group) in relation to South East Water. Previously, Michael served for 27 years as an executive director of Phoenix Energy Group, a private sector led regulated infrastructure business based in Northern Ireland, which was responsible for the development of the natural gas industry in the region. Michael joined the company on its establishment in 1996 as Finance Director before being appointed Group CEO in 2013. After retiring from Phoenix in 2023, Michael has taken up a number of roles aligned to his experience and interests including as a director at Choice Housing Ireland Limited and senior adviser to Forward Emphasis International in relation to regulated insurance and financial services. Michael is a Fellow of the Association of Chartered Certified Accountants (FCCA).

John Halsall

Chief Executive Officer

John was appointed CEO on 23 July 2026. With more than 25 years’ experience as a transformational change specialist within complex-asset intensive infrastructure businesses, John has held board level roles including chief operating officer, regional managing director, building and asset management director, and director of water services. John has led large teams (over 7,000 people) with capital and operational budgets of several billion GBP through a significant focus on customer and cultural alignment. John holds a BEng(hons) in civil engineering and is a chartered civil engineer (ICE).

Andrew Farmer

Chief Financial Officer

Andrew, who joined as CFO on 1 August 2015, has held a number of senior management posts in finance, most recently at MAG plc, the UK's largest airports group, and Doosan Power Systems, a leading manufacturing, energy technologies and services company. Andrew is a non-executive director of Moat Homes, a housing association in the South East of England. Andrew qualified as a Chartered Accountant with PricewaterhouseCoopers and holds a BSC (Hons) in Engineering and Business Studies from the University of Warwick.