Hozefa Ebrahim is a Consultant in Anaesthesia and Intensive Care Medicine at Heartlands Hospital, Birmingham, and Associate Clinical Teaching Fellow at the University of Birmingham. Michael Clarke is a Consultant in Anaesthesia and Pain Management at Worcestershire Acute Hospitals NHS Trust. Hussein Khambalia is a Specialist Trainee in General Surgery and Renal and Pancreas Transplantation at Manchester Royal Infirmary, Health Education England, North West. Insiya Susnerwalla is a Specialist Registrar in Anaesthesia at North West School of Anaesthesia, Health Education England North West. Richard Pierson is a Consultant Anaesthetist at The Dudley Group NHS Foundation Trust. Anna Pierson is a Specialist Registrar in Anaesthesia at Birmingham School of Anaesthesia, West Midlands Deanery. Natish Bindal is a Consultant Anaesthetist at Queen Elizabeth Hospital, Birmingham.