Police have reissued an appeal to help find a library campaigner who went missing a week ago.

Robert Gibson, known for his tireless work to safeguard the future of the Upper Norwood Joint Library, left his Gipsy Hill home to go for a walk at about 3pm on June 13.

He was last seen in a Co-operative shop in Central Hill later that day.

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

There has been a massive community response in Crystal Palace, with thousands of flyers distributed at train stations by friends and neighbours.

Friends say his disappearance is very out of character and they are becoming more and more worried.

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 police in Lambeth on 101 or the charity Missing People on 116000.