For what it's worth, I'm in ATC but I don't know every ICAO location indicator by heart. Same goes for the IATA codes. Plenty of aviation professionals won't be too familiar with ICAO codes, including aircrew - with the exception of those they fly to regularly. Why not just take a leaf out of another forum and use all three as a standard protocol? So the thread title could have read:
What happened at Jersey/EGJJ/JER yesterday?
Easy
