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There seem to be two acceptable answers for 29a (both of whch satisfy the definitiion and the wordplay) with no indication which is the preferred one. Or have I missed something?

I think in singular form there is only one possibility for the definition, which rules out the alternative one that fits the wordplay.

Chambers gives both spellings as the singular form of the definition and both spellings for the wordplay.

Chambers Word WIzard gives both spellings. According to Chambers 12th Edition, the first spelling is 'old', while the second is 'rare'. Since the clue says 'unusual', I will go for the second option.

Seems there may be differences between Chambers versions.

Chambers 2016 (Revised 13th edition) only has one spelling which is prefixed with “rarely”.

This is consistent with the Chambers app.

Any hints for 22d please

It a dialect word for most convenient which Chambers attributes specifically to Warwickshire and Worcestershire.
The organ is pink :-)

Organ! Groan. Thanks.