Daz. Yes, I talked to a colleague yesterday and he basically confirmed what you said, but he did add that the squadron call-sign revolved through a number of words and changed frequently but recycled. He hasn’t been able to find records of which call signs would have been in used for any given operation. I’ve checked the Form “B” and these call signs are not given there, as the operational orders were from “Group”. So there is good knowledge of station call signs, less so for squadron codes used by crews to identify their aircraft.