Martin Wainwright continues his exploration into what makes people become persistent campaigners. Last week he talked to peace activist, Lindis Percy, who consciously chose her cause but in this weeks programme he talks to Paul Lambert, who took up the fight for safety on bulk carriers when his youngest brother was lost at sea when MV Derbyshire sank off Japan in 1980. Not a man used to writing letters or locking horns with MPs or shipping magnates, Paul campaigned tirelessly at great cost to his own health and happiness, to discover the truth about the Derbyshire.