Police have released new footage in their bid to find a library campaigner who went missing six 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.

Police have since released CCTV images of a man they believe could be Mr Gibson in the Isle of Wight on July 11.

Officers have been unable to establish if the man in the images is Mr Gibson and would like to speak to anyone with information.

The man was filmed walking from High Street, Newport into Castlehold Lane, Upper Pyle Street and then into Post Office Lane in the Isle of Wight.

On the day Mr Gibson went missing he was seen in a Co-operative shop in Central Hill before travelling to the Isle of Wight.

Police released CCTV of Mr Gibson at a Co-operative 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.