2 sheds:
QUOTE
Back to the point. As has been said previously, there is no definition of the term "radar heading" and it does not feature in any standard phraseology. Hardly surprising then that some pilots are confused by it - it should not be used.
UNQUOTE
Sorry, but you are incorrect.
I have finally managed to check one of the (few) paper copies of MATS Part 1 at LACC and I came across the following:
Appendix E (Attach), Amendment 56 dated 31/1/03
Standard phrases:
Transfer on a heading : Report radar heading to (ATCU callsign) (frequency)
Seems to be fairly clear to me.