Sorry,
to make it clear. I had declared an emergency with an initial MAYDAY call.
It was is the ensuing conversation with ATC that it was suggested that I prefix all my calls with MAYDAY.
eg MAYDAY G-ABCD my engine has restarted wish to cancelled emergency.
It was this prefixing of the callsign with the word MAYDAY when involved in an distress situation that I was wondering about.
Gaz