Forget, I have no recollection of tannoy messages
Sirens, going to Ops, grabbing the callout book and a telephone. The operators were sh1t hot and very quickly knew which phones were being used for off-base callout. No sooner had I finished one call than she would ask for the next number.
There was a tendency not to call it a Mick or Mickey Finn but "an Irish gentleman has come to call".
For the groundcrew and armament teams they probably weren't standing still long enough to hear the tannoy. At Waddo the first aircraft was usually combat ready well under 2 hours and often full generation within 5 hours.
Where there were insufficient drill weapons it was usual to load live weapons (hence the later confusion about live/drill) and then off-load. Once we got WE177 we had enough drill rounds.