Thanks and welcome to Brockwell, a new Guardian setter AFAICT, for this week's Prize.
The puzzle is "to mark a 50th anniversary". I think I know the anniversary in question (being old enough to have attended a rally on the inaugural one 🤣), but don't see many obvious references in the grid, nor a Nina. Perhaps I'm missing some thing(s).
Wide range of clues: quite a few relatively easy entries, but also a lot of nice wordplay and several entries I really enjoyed. Perhaps a bit easier than the median Prize level, but fun. Had to consult Google to verify two answers, though wordplay was clear. One somewhat Pauline clue.
FOI 1d, LOI 15.
COD tie between two clear standouts, the numerical clues (27, 13) and 5. Struggled with them but was delighted when the pennies dropped. 6 and 15 also very strong, with six others on the long COD list.
Curious about how other solvers found this puzzle. I'm always apprehensive about new setters, fearing difficulty getting on the "wavelength".