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Am I right in thinking that the unclued 39 is a word which some would find offensive? I ask merely to avoid using such a word should CheeseCracker have intended something more innocuous.

That’s certainly what I have, Will. I didn’t know the word but see that Chambers notes it as ‘offensive slang’.

39A. I have a word that matches the theme and is far from offensive.

34a UK aircraft makers checking metal fabric (6) Ratine or Batine...can't find a link for Batine although it fits the clue better.....

RAE is in Collins as the Royal Aircraft Establishment which I think is what is intended.

Thank you jono

Anyone get 38d
Sea urchins bottom rough covered by American lichens?
U?NE??

Or 41a
Filipino cordillian folk in Rio got lost?
I????T

38d, presumably there’s an apostrophe in urchin’s, so it’s an anagram of SEA + N inside US.

41a is not in Chambers. An anagram of RIO GOT.

https://www.google.com/search?q=igorot&ie=UTF-8&oe=UTF-8&hl=en-gb&client=safari

Many thanks Quisling that's me done except for included 24d
PEA?

Is it PEAT?
I don't really get the included theme?
I saw the big words all right.

1234, the entry at 24 D has to have a partner - that's the theme, MIX being a big nudge to 'anagram',Match meaning there's a pair.