Yup, I recall having a nightmare some years back
Me: Hi, can I have 11 Sqn Crewroom, please
Doris: Sorry, I have no 11 Sqn listed.
Me: You must have, RAF Leeming?
Doris: Nope, sorry, I have a 25 Sqn - will they do?
...much later...
Doris: I do have an XI squadron at Leeming...
Me: PVRs
Things have evidently improved