Steven Cooper went missing from his home in Golcar near Huddersfield, West Yorkshire, overnight on Monday 21 January 2008 (his 47th birthday). He did not take his driving licence, passport, mobile phone, bank cards or a change of clothes, and he did not leave a note.
Steven was driving a blue Ford Focus which he drove from Yorkshire towards Scotland, using the A1 road for at least some of the way. He reached Greenock later the same day he went missing and went to Morrisons supermarket there about 10am.
A week later on Sunday 27 January, Steven's blue Ford Focus was found empty off the A86 road not far from Loch Laggan in the Scottish Highlands. His car had also been seen around the area in the week leading up to that Sunday.
Police made extensive searches over a 50 square-mile area, using RAF helicopters, SARDA search dogs and mountain rescue teams. Specialist teams also used sonar to search Loch Laggan but no trace of Steven has been found. He was last seen wearing a dark blue jacket, blue and white checked shirt, blue jeans and grey walking shoes. He was 6 ft 2 tall, with a slim build.
Inspector Gavin Smith of the Police Scotland Missing Person Unit said, "Steven has not contacted his family or friends since 2008. Although the last area searches ended over 10 years ago, the investigation will stay open until it's resolved, no matter how long that takes.
"We will continue to work with local officers in Scotland and West Yorkshire Police on any lines of enquiry which could help find Steven, or help explain what happened to him.
"I'd ask anyone with information about Steven around January 2008 - or any time since then - to contact Police Scotland or West Yorkshire Police on 101, or the Missing People Charity on 116 000."
Call 101 for non-emergencies and general enquiries, in an emergency call 999. If you have information about a crime you can also contact Crimestoppers anonymously on 0800 555 111.