I quite agree with the fact that Edom was prefixed Exercise and was actually commenting on the fact that message was "This is the Bomber Controller" as opposed to Cottesmore Controller.
As for the tannoys being prefixed Exercise Mick or whatever, as aircrew we were never around long enough to hear the tannoy. Certainly we heard the Bomber Controller over the bomber box and indeed it was essential that he said who the message was for:
viz "............for QRA Force only, Exercise Edom ......"
or
"..............for Bomblist Charlie, Exercise Mick ........"
AFAIK remember QRA crews reacted to a Mick readiness change but not to a Micky Finn change.