A missing 79-year-old was last seen on Monday in the Clapham area, police say.
Peter Ingleby-Dwane is 5ft 7ins tall, slim, with grey receding hair.
He was last seen in a khaki sports jacket, dark trousers and black gloves.
Mr Ingleby-Dwane uses a walking stick and suffers from dementia.
Anyone who has seen him is asked to call Lambeth police on 101.
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