Police are appealing for assistance in tracing a 48-year-old man who was last seen at St Thomas' Hospital on the evening of Tuesday 5 March.
Stephen Rushmer is described as white, of medium build and around 5' 10" tall. He has greying hair and facial stubble. He also has a scar on his right upper eye.
It is not known what Mr Rushmer might be wearing.
Police officers believe that Mr Rushmer enjoys walking, often between London and Oxford.
Anyone who has seen Mr Rushmer or knows of his whereabouts is asked to call police at Lambeth missing persons unit on 020 8721 3534.