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When lost in the Himalayan mountains, some may turn to a compass, others retrace their steps and a fair few could be forgiven for panicking.
When you are Sir Michael Palin, and have the phone number of one of the world's greatest mountain rescuers to hand, there is one other option.
Sir Michael has told how he scaled K2 after telephoning mountaineer Hamish MacInnes back home in his Scottish workshop for directions.
The broadcaster first met Mr MacInnes while searching for Monty Python locations, and now appears in a documentary film about his remarkable life called Final Ascent.
A former mountain rescue head, Mr MacInnes, 88, has climbed peaks worldwide and invented life-saving equipment, including a mountain rescue stretcher still used globally.
Speaking at the film's UK premiere at the Glasgow Film Festival, Sir Michael added: "I rang Hamish from the heart of the Karakorum mountains: 'I can see K2 how do I get there?"'
Mr MacInnes added: "I was in the workshop back home and I got a call and he had a satellite phone and he was in the Himalayas and he asked me how far is it to Concordia - that's a plateau right on K2 - and I said well it's not that far.
"He got up there with a film crew and got the most amazing footage."
The pair met during a search for Monty Python filming locations in Scotland.
The mountaineer helped to set up a rope bridge in Glencoe which became the famed Bridge of Death in Monty Python and the Holy Grail.
Sir Michael said: "In Glencoe, Hamish was helping us with certain structural problems like who would build the Bridge of Death over this terrifying gorge.
"Hamish found the place, built the bridge ... he was the head of mountain rescue and he was throwing bodies into a gorge.
"This was before CGI and special effects and we had the real thing thanks to Hamish."
Final Ascent will tell the story of how Mr MacInnes pieced his life back together from his own books and films after being sectioned in 2014 with delirium-related to dementia.
Experts now believe he could have been suffering from a urinary tract infection, with Mr MacInnes saying he may have been overwhelmed by fumes from a weed killer before being found unconscious in his garden.
After re-reading his own life story until his memory was "98 per cent" complete, he was allowed to go home after 15 months.
Speaking at the film's UK premiere at the Glasgow Film Festival, Sir Michael said: "I've had a good working life with Hamish, he's inspirational really.
"He's unlike anyone else I know and he has qualities unlike anybody else I know.
"After his illness a few years back it's so great to see him not just back on form but better than ever, almost."
Director Robbie Fraser said Mr MacInnes has "probably saved thousands of lives" through his rescues, equipment innovations and writing the mountain rescue "bible", the International Mountain Rescue Handbook.