"He is described as a white man, approximately 5ft 11in tall, medium build with short brown hair and has a tribal tattoo on the right side of his neck," a police spokesperson said. "If anyone sees Hannay or knows of his whereabouts they should call 101 and not approach him directly. "Alternatively, if you have information but don’t feel comfortable speaking to police, you can speak to the independent charity Crimestoppers. "It is 100 per cent anonymous, they never ask your name and they cannot trace your call or IP address. You can contact them online or by calling 0800 555 111."