7 was my LOI (well, 9 and 7 jointly fell at the same time) and one of my co-COD!
Thanks to Brockwell for a thoroughly enjoyable and top-class Prize. Definitely in the "difficult" category for me.
We can expect a fun "gimmick" from Brockwell, and this puzzle is (clearly) themed with an added thematic feature. I saw the theme relatively early and it was somewhat helpful in filling the grid.
A couple of unfamiliar words required Google. Certain of my answer to 18 but parsing not clear.
FOI was 2.
Many fine clues, no single COD. Top tier: 7, 28, 24, 20. Also deserving mention: 1, 3, 14 and 12. Reviewing the grid, others could be praised.