Police have appealed for help to find a library campaigner who went missing after going for a walk. 

Robert Gibson, known for his tireless work to safeguard the future of the Upper Norwood Joint Library, has not been seen since leaving his Gipsy Hill home at 3pm yesterday.

Police said officers and his family were "growing increasingly concerned for his safety and wellbeing".

Mr Gibson, 45, is white, 6ft tall, slim and has grey or silver hair.

He wears black-rimmed Prada glasses and is thought to have been wearing a grey t-shirt with green-brown khaki trousers.

Mr Gibson was chair of the Upper Norwood Library Trust, which will take over full running of the library this year, until his resignation in September.

Anyone with information on his whereabouts is asked to call Lambeth police on 101 or the charity Missing People on 116000.