Steve 76 hope this helps
CAP 413 (Admittedly an old one) states:-
Urgency signal:-
PAN PAN Preferably spoken 3 times
An urgency message should, as far as the time and circumstances permit, consist of the urgency signal and the following information which, if possible should be passed in the following order
The name of the station addressed (when appropriate)
The callsign and type of aircraft
Nature of the urgency condition
Intention of person in command
Present position, flight level / altitude and heading
Pilot qualification
Any other useful information
If I've overlooked anything I'm sure that I'll be corrected by my colleagues. And if the CAA want me for breach of copyright I'll be hiding in the shed.