Thanks to Philistine. Pleasant diversion, but so gentle as to be a bit disappointing in the Prize slot. Finished in near record time, slowed only slightly by tricky parsing of 20 and unaccountable hesitation on 7.
Several of the 4-letter solutions were extremely easy, and 4 in particular crossed over into "trite" territory (how many times has *that* chestnut been used?).
FOI 9, LOI 7.
COD tie between 10, 20 and 23. Impressed by 20, as I thought the clue was incorrect until the penny dropped re. a wordplay subtlety. 1d, 3, 8, 1a, 16 and 22 also elicited smiles.