Hi Dave
As you can see from this Wikipedia search result "Red light returning" applies only in Japan, the Americas, South Korea and the Philippines.
See
http://en.wikipedia.org/wiki/Port_and_starboardI have not been able to find out why or when the difference from the rest of the world came about. I would be interested to know
Best regards
Clyde
A port buoy is a lateral buoy used to guide vessels through channels or close to shallow water. The port buoy is one that a vessel must leave to port when passing upstream. If in International Association of Lighthouse Authorities area A, the port buoys are red. If in IALA area B (Japan, the Americas, South Korea, and the Philippines) then the "handedness" of buoyage is reversed, and a vessel leaves black or green buoys to port.
Mnemonic devices for buoys in IALA area B:
Best People On Earth = "Black Port on Entering"
RRR = Red Right Returning