Hi again Mikey,
I don't have your crossword to hand so I'm thinking aloud but my first thoughts on the other clue were (w)ides as in the ides of March (Julius Caesar) but it's unlikely you have both letters wrong.
Well...you have confused me now !
27a...Espionage wars backed region in the wars
CODE BREAKERS.
But OMEM looks good, so not sure where I have gone wrong....So must be CODE BREAKING