Finished, earlier than usual, and before reading the forum ... though I couldn't parse 4d or 12a and was pleased to see that I wasn't alone, and grateful for the explanations.
Had a largely empty top half until cracking 8 with help of Crossword Solver, which led to 2d, 11a, 6d, etc.
Foi: 18
Loi: 7 - last of a quartet of 5a, 5d, 7, and 9 which fell neatly after Crossword Solver suggested the right "sharp". (Is the electronics firm really well known? I only know the name because we've got one.)
CoD: 2d perhaps, but several other clever contenders!
A satisfying puzzle, though I'm not keen on clues which depend on another clue having been solved, like 8d and 12a, both ingenious clues.