My understanding is, without checking in CAP413, is the correct thing to say is:
xxxxxx traffic - G-ABCD position report and intentions
It is your duty to call up in the first place. It is very helpful of another aircraft to report the frequency appears closed if they have already tried rather than leaving you wondering if you have the wrong frequency or the box has failed
This makes sense to me. Sorry if it seemed that I was arguing you did the wrong thing
jez, there was nothing wrong with what you did, and I'm not complaining.
FFW