The parents of a man who went missing on a night out in York have made an emotional appeal for information on the fourth anniversary of his disappearance.

29 year old Rory Johnson-Hatfield from Skipton was last seen in the early hours of the morning close to Clifford's Tower and then near the city's Mill flats, on the opposite side of the River Ouse.

No trace of him has ever been found despite searches, including the river. His parents still believe he may be alive.