I first joined the RAuxAF in 1985, even then never wore anything on the working dress uniform (green or blue) that marked me out as an "Oggie". Was a different story for the Occifer-types.
Talking of the No.5's, I still have a very nice set (with the aforementioned "A's"), only worn a few times, to fit a short, slightly portly chap, if anyone's interested - don't have a use for them anymore
(and, yes, I did buy them).