"I'm Sorry I Haven't A Clue" has been voted the greatest radio times comedy of all time by a group of expert judges.  The top 20 list included in the Guardian article also includes "Hello Cheeky", a 1970's radio series starring Tim Brooke-Taylor, Barry Cryer, & John Junkin
https://www.theguardian.com/tv-and-radio/2020/nov/17/im-sorry-i-havent-a-clue-greatest-radio-comedy-says-panel-radio-4

Note that the new series of ISHAC, which includes the final recording with Tim Brooke-Taylor, debuts on BBC Radio 4 Monday, 30 November.

If anyone has the full top 40 list from Radio Times please let us know if "I'm Sorry I'll Read That Again" also made the list.