Many consider the Bristol Channel pilot cutter to be the finest sailing boat design ever. Fast, seaworthy and beautiful to behold, the pilot cutter is the perfect combination of form and function - a thoroughbred perfectly adapted to a life in one of the Britain's most treacherous stretches of water. Sailor and writer Tom Cunliffe explores the life of the pilots and sails a perfectly restored cutter to find out just what drove these men and their wonderful machines.