If you want an example (to take us even further from the question in my original post), explain the value of "OUT" in CAP 413's "Standard Words and Phrases"
Nothing whatever to do with the UK, this is ICAO phraseology and is not, as CAP413 makes clear, normally used in V/UHF communications. Not surprisingly, therefore, it has little or no value to private pilots who seldom if ever have to cope with the vagaries of HF propagation.
Thanks, Chevvron, for correcting my earlier typo.