Thanks to Qaos for this week's Prize challenge.
I thought there were many elegant and enjoyable clues, but a few perhaps (YMMV) slightly strained.
Most of the grid filled quickly, but a handful difficult and obscure clues extended solving time beyond the norm. One short clue I guessed but had to look up with Google, solution dependent on GK I'd no idea of. One longer clue involves an obscure usage I had to confirm online.
FOI 1d, LOI 18 which puzzled me no end and still seems a bit awkward.
Still not certain of 25's parsing, though there's only one possible reasonable solution.
Co-COD 29 and 24, which is somewhat arbitrary as there were many contenders including 24, 28, 12, 21, 26, 20 and 11. Bottom half of the puzzle very strong.
Qaos is fond of "ghost" themes. I see a couple of possibilities, but nothing clear jumps off the screen.