I'm Sorry I Haven't a Clue 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. The final show of the 2008 "Best of" tour on 22 April would be presented by Rob Brydon. Following Lyttelton's death there was speculation that the series might be cancelled because replacing him would be extremely difficult if not impossible. In a eulogy in "The Guardian", Barry Cryer did not allude to the future of
I'm Sorry, I'll Read That Again It also may have influenced other spoof-based British radio programmes such as "Radio Active", "On the Hour", "The Sunday Format", "The News Huddlines", and later "Bleak Expectations". Several cast members have since appeared in the radio comedy panel game "I'm Sorry I Haven't a Clue", a spinoff from "ISIRTA" that has outlived it by decades. Tim Brooke-Taylor and Graeme Garden continue as regulars on the show. Episodes of "ISIRTA" have frequently been heard on BBC Radio 4 Extra (available on digital television, DAB digital radio and the web). Listeners in Australia occasionally find "ISIRTA" in the 5.30am vintage comedy timeslot