Finals19, you have obviously studied the matter to more depth than myself. As you may have observed, I am writing from abroad. And though I have repeatedly come upon differences between the UK and the real (ICAO) world, I keep on committing the gross error of considering the UK a normal place.
In my simple world, an R/T operator either has authority or has none. The UK seems to know more nuances, as you say, a rather gray environment. I can only wish you the best, and am again confirmed in my hesitation to ever cross the English channel. There's obviously dangers hidden there, far worse than ten minute's flying without a plan B.
You had better consider my earlier reply non-existant, I think.