Kirsty Young's castaway is the former rugby player and commentator Brian Moore.
As a player he was ferociously competitive, he says his approach to the game was almost pathological and it earned him the nickname 'the pitbull'.
By the time he retired, he'd earned dozens of England caps and played in three grand slams. But he discovered the obsessive determination he'd shown as a player was not so useful off the pitch.
"In sport, the 'I won't give up', 'carry on training' and 'going again and again and again', that's rewarded because people say isn't that fantastic - but when it comes to normal life, you can't solve everything like that."
Producer: Leanne Buckle.