Police have released new information about a sighting of a library campaigner who went missing two weeks 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 before travelling to the Isle of Wight.

RELATED: Police release fresh information on sighting of missing library campaigner Robbie Gibson

Police have since recovered CCTV footage of Mr Gibson at a Co-op store in Landguard Road, in the Isle of Wight, on June 13.

He purchased a number of items at 7.45pm before walking out of the shop and across the car park in the direction of Shanklin town centre.

Mr Gibson, known by friends as Robbie, enjoys coastal walks and stays on campsites, according to police.

He was 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.

On June 21 police released CCTV images of his arrival in the hope that someone may know where he is staying.

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

There has been a huge community response in Crystal Palace to Mr Gibson's disappearance, with thousands of flyers distributed at train stations by friends and neighbours.

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

Some friends are believed to have travelled to the Isle of White in a desperate bid to find him.

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 a khaki barbour-style jacket, brown trousers and white trainers.

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