UPDATE: Mr Fuller has now been found, the Met Police said this morning (January 10).
The family of a 78 year-old man suffering from dementia are appealing to the public to help trace his whereabouts.
Shortly after midnight today (January 17), James Fuller of John Ashby Close, Brixton, left his home and is without his medication.
He was last seen wearing navy blue pyjamas, black slip-on shoes, a brown knee length coat and a grey tweed flat cap and glasses.
He is described as black, five feet ten inches tall and is frail.
Anyone with information is asked to call Lambeth CID at Brixton Police Station on 07785 774447.