The Sunday Times, 

On a Tuesday morning last November, Colin Rattray watched as a surgeon amputated his lower right leg and popped it into a plastic bag. An infection had turned the bones in his feet to mush and he was too ill to risk general anaesthetic. Local was the only option. As he felt the vibration of the bone saw cut first through the fibula and then the shin bone, his overriding emotion was “relief”. “They weren’t removing my leg,” he says. “They were getting rid of the infection that would have killed me.”

Colin was diagnosed with type 2 diabetes 20 years ago. He was 31, a successful executive in the hospitality industry and, as he puts it, he felt immortal. He took the diagnosis in…