Police have released new information about a sighting of a library campaigner who went missing a week ago.

Robert Gibson, known for his 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.

Later that day he was seen in a Co-operative shop in Central Hill.

Officers now believe he has travelled to Hampshire.

He was last seen at 6.45pm on June 13 catching the catamaran from Portsmouth to Ryde.

He is then believed to have boarded a train at Ryde Pier Head towards Lake and Shanklin.

Mr Gibson, who has a wife and son in primary school, is known to enjoy coastal walks and often stays on campsites.

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.

Joe Duggan, who has known Mr Gibson for six years, begged him to make contact with family and friends.

He said: “He is passionate and has a natural enthusiasm but at the moment we don’t know if he is in the right head space and that is what we are worried about.

“We are worried that he is in a vulnerable state and we are just concerned about his wellbeing, his family and friends just want to be reassured that he is somewhere safe.

“Just let us know you are OK Robbie, we are all worried about you.”

Mr Duggan, who has been working with members of the community to hand out flyers and conduct searches, added: “There has been a fantastic community response, a lot of people care about him – it has been exceptional.

“Everybody wants to do something.”

Famous names including Boy George, Zoe Ball and Theo Paphitis have helped to spread the word about the appeal.

Mr Gibson has been the leading member of many community campaigns.

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

In 2014 he helped set-up the ‘Sensible Garden’ in honour of South Norwood punk legend Captain Sensible. The garden won a Croydon Champions award the following year.

Steve Reed, MP for Croydon North, who has worked with Mr Gibson on numerous community campaigns, including protecting the future of Upper Norwood Joint Library, said: “He is a huge champion for the community and it is tragic that he has gone missing.

“He has had a period of ill health and everyone is very worried about him and if he is reading this I hope he will contact the police just to let his family know he is OK.

“His poor family must be beside themselves with worry.”

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.

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