Hi PDM
I thought it was very hard too. I've finished all bar two - 25ac and 15ac, but I can't be bothered anymore. There are a couple I'm not sure of as well.
My FOI was 13d as a guess, though I couldn't see the wordplay. My COI was 1d and 4d, but I'm puzzled by the S at the end of the latter. I think the word is an adjective and not a noun.
I've never heard 12ac and I think it is cheating to use a phrase that isn't in common usage.
Off to bed early so I can get up at usual time tomorrow. Lots to do.