Conversation so far:
What is Extras' When the Whistle Blows?
When the Whistle Blows is the show-within-a-show sitcom created, co-written by and starring Andy Millman.
What was Extras' When the Whistle Blows about?
When the Whistle Blows is set in a Wigan factory canteen. The humour is broad and lowbrow in the manner of many catchphrase-based sitcoms.

Question: How did When the Whistle Blows compare to Extras?
Self-contained rewrite: How did the show-within-a-show When the Whistle Blows compare to the show Extras?