Thanks to Tramp. On the difficult side (though definitely gentler than last week's Paul) but great fun. I recall enjoying T's last Prize as well.
Upper half of grid filled quickly but the Southern half was a struggle.
FOI 1d, LOI 20.
As a wannabe BBC member, co-COD must be the intersecting 16 and 20.
Long list of contenders: 9, 6, 21, 2, 22, 23, 3, 12 and 11.
Have a clear parsing for 24, confident of solution but unsure of definition. Perhaps lacking GK.