Agree about the posters and it brought back memories for me seeing "Mel Bush presents" at the top of one of the mock posters given that I did a lot of work with Mel at the time with Sir Cliff and David Essex. Obviously a lot of work went into being historically correct. Having PG appear on a Segway in the first series was a master stroke!
mind you maybe the most subtle master stroke was Jane Asher playing his ex-wife and Paul "McCarthy" talking about his musicianship!!!