Andy McNab faced the IRA in Northern Ireland, served on numerous SAS covert operations around the world, and was captured behind enemy lines in Iraq.

But he tells Kate Gerbeau the real moment that made him was reading a Janet & John children’s book at the age of 16.

It unlocked the Army career which took him away from a life of teenage crime, and eventually led him to becoming a bestselling author of more than 50 books, all thanks to a Sergeant Major who he thought was “the world’s oldest soldier”.