Thanks to Paul for an enjoyable Prize. Don't know how to rank difficulty: I had a lot of trouble getting started, made fast progress once I noticed the theme, but found several clues extremely tricky. Maybe on the hard side for a Prize.
FOI 19, at the time I despaired of getting any!
LOI 10, which I'll call COD, though 13, 16, 20, 21, 22 and 24 also deserve praise IMO.
Paul on his genteel side, only a couple of tame suggestive entries.
This week I fulfilled one of my crossword fantasies by spotting a couple of Ninas.
There's a short possible Nina in the 8th row which reminds me of a column in Nutmeg's #28,586, but I think it's probably chance, because I can't see a follow-up.