I cannot specifically comment on the communications with operation Market Garden, but for Bomber Command operations and with Pathfinders, the Master Bomber used code phrases, such as “Bomb Freehand” which might refer to bomb built up areas visible through cloud. This in the event that marking was inaccurate. There was not a lot of chatter. I have some documents at home as to how some of this was controlled. Note that for Bomber Command, instructions were relayed to stations by means of the teleprinter, and the documents in question being termed the “Form B” these are available at the national archives at Kew. I am pretty sure there would be similar documents at the National Archives at Kew for the operations you seek. I don’t know what the “air” file numbers these are, but they may already be referenced in a good history of OMG.
Perhaps more relavent for Market Garden may be the the methods used by Bomber Command for Gaggle formations. Some of these details were still being worked out at the time of MG.
Finally, highly unlikely anything of note would be broadcast over a Tanoy system!
Jim
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