Many thanks to Picaroon for an outstanding Prize offering this week.
I really enjoyed this one: challenging (solidly above median Prize difficulty) but reasonably accessible, with a plethora of outstanding clues, several extremely funny.
First pass went slowly. FOI 23 and I gradually established a toe-hold in the SE quadrant.
LOI 24, a funny word I learned from crosswords some years ago.
COD a difficult choice due to embarrassment of riches. Co-winners 20 and 14, with 24 and 7 (not difficult but a nice misdirect) completing the podium. Clues 16d, 16a, 17, 15, 19, 22, 26, 11, 18 and 5 also excellent (yes, I enjoyed this one).
I suspect a theme of sorts, perhaps UK-oriented, but uncertain. Maybe a subsidiary theme as well.
Found the puzzle tricky, so difficult to suggest hints, can only refer to the SE quadrant comment above.