I like Brockwell's puzzles. A little easier than normal for me but maybe i was on the wavelength today. There may be some obscure GK involved but they're all very gettable from the clues. I remember a lot of 20a in art classes in the 1970s and I also knew 18a but by name only. A very interesting one to pull out the bag that one. I however have no idea why 7,12 is thematic.
COD 8a as soon as I got it I knew it would take some beating. It was also my FOI. LOI was 17a.
Darla, that must be an interesting place to be right now.