"Only the 1st call to any radar unit after T/O should include passing level/alt, unless requested by ATC."
It is not always the first radar frequency a passing level must only be given to. It must also be given to the first
en-route ATS unit, ie London,Manchester or Scottish Control.
Format of Initial Calls
Pilots of aircraft flying Instrument Departures (including those outside controlled
airspace) shall include the following information on initial contact with
the first enroute
ATS Unit (see also Chapter 6 Approach Phraseology Paragraph 1.1.2):
a) Callsign;
b) SID or Standard Departure Route Designator (where appropriate);
c) Current or passing level; PLUS
d) Initial climb level (i.e. the first level at which the aircraft will level off unless
otherwise cleared. For example, on a Standard Instrument Departure that involves
a stepped climb profile, the initial climb level will be the first level specified in the
profile).