Thanks Malone,
I've got a completed grid (with everything written in pencil) but I'm not totally sure which clues have the unparsed letters.
I think these clues have one or more letters with no wordplay. Can you confirm if they are right or wrong?
39a TI
41a NG
1d A
21d PIT
I know there are more but I just want to know if I'm on the right track.