Finished, very much joint effort with husband, but before reading any forum posts. Used CrosswordSolver just once: was fairly sure of last 7 letters of 11a but couldn't get any further: the one answer it came up with was the right one, and obvious once you know it.
FOI 6 or 10 (he can't remember)
LoI: 13
Cod: difficult, but I liked 12d.