I found this about average Prize difficulty.
Noting the obvious theme, I feared it would be too UK-centric, but wound up handling it with minimal Google bailouts.
There were several very easy clues, but several that I struggled with. Needed lots of crossers for the long anagrams, which slowed progress.
I hear you on 24, brendan.
If my solution to 13 is correct (which it probably is, given 2 crossers for a 4-letter word), I found the usage unusual.
FOI 10, LOI 8.
COD tie between 27 and 17a; other contenders 6, 24, 20 and 15.
Thanks to Tramp.
There seems to be a second theme (if the acronym common to several clues means anything), though perhaps it pertains to the theme subject (about whom I know next to nothing).