Martin Thomas is the former Commodore of the Ocean Cruising Club, and is currently the Vice-Commodore of the Royal London Yacht Club. A distinguished surgeon, he has written as well as given talks and practical training on emergencies at sea and medical treatment for yachtsmen. He is the editor of Adlard Coles’ bestselling Heavy Weather Sailing. Dr Olivia Davies is a Consultant Anaesthetist at University College London Hospital and Honorary Lecturer at UCL.