Since graduating from Salisbury College of Art in 1980, Humphreys has gone on to create some of horror cinema's most enduring images.

BBC: Film poster artists revive a dying craft

Dr Peter Hargreaves, a consultant in palliative medicine, Dr David Hill, fellow of the Faculty of Anaesthetists of the Royal College of Surgeons, Dr Elizabeth Negus, a lecturer at Barking University, and Dowager Lady Salisbury, chairman of Choose Life, were the other signatories.

BBC: 'Crisis' over terminally-ill care