I'm Sorry I Haven't a Clue down opportunities to work on it as he preferred to remain a listener. The official, authorised history of the show and ISIRTA, "The Clue Bible" by Jem Roberts, was published by Preface Publishing in October 2009. Humphrey Lyttelton, primarily known as a jazz trumpeter and bandleader, was invited to be chairman because of the role played by improvisation in both comedy and jazz music. In the first series Lyttelton shared the role of chairman with Barry Cryer but he made it his own (especially once Cryer replaced Cleese as a regular panellist) and continued as chairman until his death on
Humphrey Lyttelton 2007, Lyttelton presented "The Best of Jazz" on BBC Radio 2, a programme that featured his idiosyncratic mix of recordings from all periods of the music's history, including current material. In 2007 he chose to cut his commitment to two quarterly seasons per year, in order to spend more time on other projects. In 1972 Lyttelton was chosen to host the comedy panel game "I'm Sorry I Haven't a Clue" ("ISIHAC") on BBC Radio 4. The show was originally devised as a comedic antidote to traditional BBC panel games (both radio and television), which had come to be seen as