After years of mental illness Guy Stagg embarked on a walk from Canterbury to Jerusalem, spending ten months on a 5,500 km medieval pilgrim route, a journey to the centre of the three Abrahamic faiths. And all this despite having no faith or belief in God.

He joins Mark Dowd in Canterbury, retracing the footsteps of where it all began, to discuss why as a non-believer, he hoped the extraordinary adventure would heal him.