In 1985 he became a lay member, then non-executive director and finally deputy chairman of health authorities covering the boroughs of Ealing, Hammersmith and Fulham, and Hounslow in West London, serving until 2000. He subsequently chaired the West London Pathology Consortium (a collaboration between a number of acute hospitals in West London),the North West London sub-committee of the Advisory Committee for Clinical Excellence Awards, and Building Better Health West London (a Local Improvement Finance Trust company building community and primary care facilities for the NHS) and worked as a director of MediHome Limited. He was appointed Chairman of
West Middlesex University Hospital NHS Trust in October 2010 and a Trustee of Versus Arthritis (formerly
Arthritis Research UK) in 2012. and in 2015 became Chairman of West London Mental Health NHS Trust (renamed
West London NHS Trust in 2018) which is responsible for local inpatient and community mental health services in the London boroughs of Ealing, Hammersmith and Hounslow and nationally commissioned high security psychiatric services including
Broadmoor Hospital. Following the establishment by the Government of Jersey of an Advisory Board for the Crown Dependency's Health and Community Services in 2023, Hayhoe was appointed as its first permanent chair but departed after little more than a month citing differences in working style with the Jersey government minister, Deputy Tom Binet only days after announcing plans to spend taxpayers' money efficiently, make the system more transparent and improve the board's engagement with the public. In December that 2024 he was appointed Covid Counter-Fraud Commissioner in HM Treasury on a one-year contract to examine an estimated £7.6 billion of Covid-related fraud with a remit stretching beyond disputed PPE contracts to include spuriously received business support loans and grants; erroneously claimed furlough payments; and abuse of the Eat Out to Help Out scheme. His report,
Pursuing Recoveries, Preventing Reoccurence was published on 9 December 2025. In April 2026 the Department of Health and Social Care announced his appointment as chair of the
NHS Counter Fraud Authority. Hayhoe has worked extensively in regulatory roles alongside his other appointments, serving as an executive reviewer for the
Care Quality Commission and an external assessor for the
College of Policing, a tribunal chair for the
Nursing and Midwifery Council and the
Association of Chartered Certified Accountants, and chair of the Taxation Disciplinary Board and the Legal Services Consumer Panel of the
Legal Services Board. == Politics ==