Just curious: Are dayglow colours (like bright orange) legal to use for civilian a/c in the UK? In Germany they aren't. Even for details like wingtips. Only permitted for military a/c.
Colourwise the yellow Cubs (and Auster down there) seem to be most easy to spot. Would discourage greys and light blues.
http://www.rafmuseum.org.uk/cosford/...-antarctic.cfm