Trailer: Billy Connolly: Portrait of a Lifetime

Celebrating Billy Connolly's 75th birthday and 50 years in the business, three Scottish artists - John Byrne, Jack Vettriano and Rachel MacLean - each create a new portrait of the Big Yin. As he sits with each artist, Billy talks about his remarkable life and career which has taken him from musician and pioneering stand-up to Hollywood star and national treasure.