apart from a handful of Kiwi courses, Pebble Beach, Bethpage and Valderrama, my world list is pretty much an Australian/GB & I list.
My Top 5 wouldn't change, which would be RCD, Dornoch, RMW, Portrush, North Berwick West.
I find it impossible to 'rank' British courses, as most of them I've only played once and other factors would too heavily influence my thoughts.
RCD though is the best course I have played anywhere though.