Your previous post was my reference
BTW, the words "radar heading" are not in CAP413 either, but are used frequently in ATC environments. Personally, it seems sensible to me, if incorrect in theory.
Why is it incorrect in theory?
"radar heading" is not CAP 413, but it is in the Manual of Air Traffic Services- part 1 (CAP 493) "report radar heading to (ATCU C/S) (Freq.)" hence where it comes from.
There is no difference between "heading" and "radar heading".
One of the many quirks of UK phraseology!
Meanwhile, back to the topic, standards are still low, even with or without the use of "radar"!