So Parkrun by the sea cleared the head and I was able to close off the NW finally. I would say to anyone coming after, don't think too much about 1a. I was going off down all kinds of rabbit holes. When I got back suddenly it was clear.
Very tough to get started but the anagrams are a good way in as is 4d when the penny drops. Not Paul's best I don't think. Felt a bit awkward. But thanks of course because I always enjoy the Saturday prize.
FOI 17d and like others also COD.
LOI 21a.