At Heathrow they practice the "contact Tower with callsign only" procedure so just say your callsign
Errrr.... They did for a short time some while ago, but now the "Callsign" only seems to be quoted for the change to 120.4 ?
In fact, I always call with C/S only, but seem in a minority or 1! The Twr seem to know exactly who / what / where I am...
NoD