Mr Allan was last seen by his family at around 8.15am on Friday, 23 October, at Westmains Farm, near Stonehouse. He was reported missing later that evening.
Police Scotland has launched a major search operation across farmland and the surrounding area, involving specialist officers, police dogs, a helicopter, dive and marine units, and mountain rescue teams. Other agencies are also assisting.
Mr Allan is described as white, approximately 6ft 1in tall, with grey hair. When last seen, he was wearing blue overalls and a white cap. He may also be wearing a green jacket.
Officers are particularly keen for local residents to check buildings and sheltered areas where he may have taken refuge.
Inspector Colin Thapar said:
“We are very concerned for Tom’s welfare and we are keen to trace him as soon as possible. As our searches and enquiries continue, I would urge anyone living, walking or driving in the area to keep a look out for Tom. Please check gardens, sheds and outhouses in case he has sought shelter.
Anyone who has seen Mr Allan, or has information about his whereabouts, is urged to contact Police Scotland on 101, quoting reference 2759 of 23 October 2026.
Source: Police Scotland, 23 October 2026.