In message , at 17:44:07 on
Thu, 5 Feb 2009, Alan Braggins remarked:
Elsewhere in the report he says that it is green and yellow down the
side, red and yellow check to the rear end, and that it displays the
word ambulance (in unspecified colours).

http://www.ukemergency.co.uk/ambulance/dcp01118.jpg

The description of the vehicle as marked "in bold red and green colouring"

I suppose you could interpret the vehicle pictured above as "White and
Yellow" with "Red and Green markings", but it wouldn't be my most
intuitive way of expressing it.
--
Roland Perry