Chris Whiten, Consultant Anaesthetist, Imperial NHS Trust, London, UK, Lara Coppel, ST7 Anaesthetic Registrar, Imperial School of Anaesthesia, London, UK, Abigail Richardson, ST7 Anaesthetic Registrar, Imperial School of Anaesthesia, London, UK, Harriet Kemp, Clinical Research Fellow, Pain Research Group, Imperial College, London, UK