seen recently on S15 (DOVER for the old lads!);
IBENT - a bit queer that one
and Bexil160's favourite
GBL05T - coming 'up the hill' via GUBAR
Didn't see this one myself so it might be a LACC myth - there was a USAF tanker callsign - W4NK1..... except an 'A' instead of a 4
or what about the reporting points in Scottish FIR...........
ITSUX MADAD