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[a.trembath]

12 letters

British upper class caricature unfortunately is rather like Sir Humphrey

[Lie-in King]

39a Bureaucratic - anag B(ritish) + U(pper class) + caricature

Refers to Sir Humphrey Appleby from Yes, Minister

[a.trembath]

Thanks a lot, Andy

[dunbraynin]

Please don't forget to include the clue number and any letters you have; as indicated in the guidelines for posting a question. This enables those without the crossword to enjoy solving and helping.

[a.trembath]

Thanks for those comments - will do!