Thank you to all of you for giving me 3d, which gave me 8ac, 2d and 1d.
I started very late and am very tired (the shed/garage project is nearly finished). I only got two on my first read through and nearly gave up but with the start you gave me I've done all but 25 ac Cat in conversation chain (5)
I have U?N?S, but I think my crosser from 21d may be wrong. Any hint would be gratefully received.
It helped enormously once I got the film, but there are quite a few I cannot parse completely, including 21d.