'The Snowman', has become a staple of Christmas and with books such as 'When the Wind Blows' and 'Fungus the Bogeyman', Raymond Briggs is one of the UK's most loved authors and animators. But his latest project is a personal one, 'Ethel and Ernest' tells the tale of his parents' life, an ordinary experience made extraordinary by Raymond's tender wit and care. Tim Muffett meets the man himself and the team behind the film. | BBC Breakfast