Ah, good old 546!
In my logbook a few times.
In the earliest days, the ULAS Bulldogs had red prop spinners, and a squadron badge (the book superimposed on a red cross inside a black edged shield) on the battery cover on the starboard side only.
http://www.xx554.com/photo_gallery/x...n3June1976.jpg
By the time I was on ULAS (1979) they had a black/white spinner and the same badge.
Air-Britain : Scottish Aviation Bulldog T1
Some time after 1982 the red first aid cross turned green, and the badge changed to the full crest on a black rectangle. This was applied on both sides. The fin flash was changed to a sloping one, and the underwing serials disappeared.
Mad Dog Flying Group