Hi
Red should be flown at all times. White is a house flag and can be flown at any time.
Red is flown from the Starboard lanyard & white from the port.
Be sure to get the correct size of ensign. BECC is the best maker 1/16th scale 400mm X 200mm I think size C. please check. (1/12 550mm X 250mm please check this one as I only do 1/16.)
Hope this helps.
tonyO