AP1358 Chap 10:
Civilian Functions
1010. At civilian and other functions, when the order of dress is not specified and it is known that more than one RAF officer will be attending in uniform, the senior RAF officer is to decide on the dress to be worn and inform the other RAF officers attending of his decision.
This is extremely useful, if only I knew how to navigate through the terrible JSP/AP archive on the defence intranet, maybe then I could also find the regulations that surround Holding Officers, and prove i'm being mistreated!
Couple of my fellow holding chums have said they wore 5's to a university ball and that turned out quite well for them despite being a rather grotty affair!