Flower,
Thanks for the link.
Looking at the list of priorities, I'm a little confused.
Categories A-E seem to be for Emergency, S&R, Politically important people, and CAA flights.
Then we have normal flights, which include "Flights which have filed a flight plan in the normal way and conforming with normal routing procedures", and also Instrument flight tests.
Lastly is category Z which includes training and all other flights.
I see nothing in the list which prioritises Scheduled, Chartered, Commercial, Fast, Large, Heavy or IFR traffic.
Presumably it is the "Flights which have filed a flight plan in the normal way and conforming with normal routing procedures" but that includes CAT. Is this to say that a light aircraft, which files a VFR flight plan, and complies with normal routing procedures gets the same priority as the commercials? This isn't what happens in practise, at least in my experience.
That section does make a comment (which I don't understand) that the table is not for flow control. Perhaps this is not the section you had intended to reference to?
dp