Thanks to Fed.
I found this extremely gentle, not far from a write-in as far as filling the grid was concerned, but the parsing of several clues then required significant time. So Prize worthy.
FOI 9, LOI 3 (frustrating to stall out on such a short clue, but I lacked some GK here).
COD 21. Short list adds 13a, 7 and 14. Long list adds 10, 11, 12, 18, 5 and 6.