Yes, very tricky indeed. Thanks to Brockwell. I often get nervous and have trouble with relatively unfamiliar setters, but I think this was a real challenge. I really enjoy "outside the box" cluing.
FOI 1, LOI 24.
Some naughty parts, I had (4,12) as joint COD for a while but decided to go with 17. At least 10 clues were somewhat COD-worthy...I gave up enumerating the candidates. Let's just say there are many clever/non-obvious parsings.
Brockwell seems to favo(u)r themes or special features. I have a strong feeling this puzzle has at least one, but can't fully grasp it.