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Two very convincing arguments, with differing conclusions. I do hope that you good people will let us English know what the answer was (tomorrow?)

18A Pet file format (4) t?f?
21A To any farther on (5) a?o??
20D Wild oats school (4) ???o

I think these are

TIFF, AYONT, STOA

"I do hope that you good people will let us English know what the answer was (tomorrow?) "

Next Monday

Thanks to Keith. Think diktats better than my word. And fits with other answers.
I think the important word in the clue for 12d must be 'from'. Which would lean the answer towards hardback.

4D 'Idle language' can't be PATOIS if 10A is 'UP ANCHOR'. The letters are P-T-O-. Is 'PYTHON' a language, then?

Yes - it's a programming language

https://www.python.org/

http://www.python.org/