For the benefit of 411A and any other regular visitors to the UK's excellent ATC services, 'kishna' has kindly provided a link (a few boxes up) to CAP413 which defines UK SID procedures, and other filed exceptions/differences to ICAO, and from Chapter 6 (1) of which I quote:-
"1.1.2 Pilots of all aircraft flying Instrument Departures are to include the following information on first contact with approach control/departure radar:
a) Call sign;
b) SID Designator where appropriate;
c) Current or passing ALT/FL; PLUS
d) Cleared ALT/FL. For Standard Instrument Departures involving stepped climb profiles, state the initial ALT/FL to which the aircraft is climbing."