West Coast, Granny Smith has covered what it is.
My gripe is the lack of a mandatory readback, OK, I've told the crew it's a radar advisory service, it's on the tape.
BUT is the proverbial hits the fan and something goes wrong, I'm then criticised for not getting the required readback, it may just be an exercise for the tape since I would gues that the US crews (in the majority of cases) haven't got a clue as to the differences in the type of service being provided.
Maybe crews flying into airports in the UK which require transit of uncontrolld airspace should be made aware of the differences in service through some sort of safety bulletin