Last week, the Prime Minister David Cameron spoke movingly about the close relationship he had enjoyed with his late father. Easy at first, antagonistic, incomprehensible, often entirely absent for years; admiring, funny, supportive, valedictory: the conversations other sons have or don't have with their dads are the landmarks of one of the most significant of all family relationships. Using material contributed by listeners, BBC producer Neil George - aided by some vintage recordings of his own dad who was a former radio correspondent - explores this often delicate relationship ...not always as fulfilling than that enjoyed by the Prime Minister and his late father. Producer: Neil George.