The illustrator and author paints scenes from a 70-year-long career, including his work with Roald Dahl. With David Walliams, Joanna Lumley, Peter Capaldi, Ore Oduba and Michael Rosen.

Forty years after `The Snowman' was first broadcast, the story of how Raymond Brigg's classic tale was made and became a Christmas institution in over 29 countries, spawning hit singles, a cameo from David Bowie, and a host of snowy spin offs.