Any programme about Billy Connolly is always worth watching but this sounds like a particularly lovely one as the world famous comedian celebrates his 75th birthday and 50 years in the business. To mark the occasion, Scottish artists John Byrne, Jack Vettriano and Rachel Maclean will each create a new portrait of the comedian and actor. As he sits with each artist, Billy talks about his remarkable career which has taken him from musician and stand-up to Hollywood star and national treasure.