 He did occasionally depart from the script, however, often bringing the house down with an ad-lib.He was credited by the regular panellists as being the chief reason for the show's longevity.On 18 April 2008 the producer of "I'm Sorry I Haven't A Clue", Jon Naismith, announced that, owing to hospitalisation to repair an aortic aneurysm, Humphrey Lyttelton would be unable to record the scheduled shows and that they would have to be postponed.