Neal Kerner was last seen leaving his home in Aysgarth at 11am on August 10. He set out for a walk wearing walking gear with a checked shirt, black fleece, dark walking trousers and boots. Neal left his mobile phone at home when he left, and has not been seen since.

North Yorkshire Police said it believes Neal is in the Wensleydale area and has used extensive resources, including the police helicopter, in a bid to track him down.

Officers have also been assisted by the Swaledale Mountain Rescue team.

Neal Kerner has not been seen since he left his house for a walk on Thursday, August 10.

Inspector Mark Gee from North Yorkshire Police said: “We are currently extremely concerned for the welfare of Neal Kerner and are currently focusing our searches in the Wensleydale area. I urge anyone who is out walking in this area today or this weekend to be vigilant and to report any immediate sightings of anyone matching Neal’s description to 999.

“I’m also appealing to local landowners to please check out buildings to see if Neal has come to any harm and is taking shelter.”

Neal Kerner: Police increasingly concerned for walker who has gone missing in Yorkshire Dales National Park