Yep, Nick, those are good examples of what it is all about.
I wonder if "ASC" is Bletchley's abbreviation for Air (or Air Force) Signals Commander = [Luft]-Nachrichtenführer (abbreviated: Nafü)? Even the lowly ARCs had a Nafü, while commands lower than that, such as a Fl.H.Kdtr., simply had a Nachrichtenoffizier (abbreviated: N.O.). But this is just speculation until Jim Norton (abbreviated: J.N.
) gives us some more to go on.
L.