No idea if this will help or not, but i heard about a new insurer who specialises in young drivers - they are called Woop, but beyond this (& the fact i've seen a couple of vinyled up Fiat 500s locally to me - in Thaxted, Essex), i don't know much more.
EDIT: Just found their facebook page:
http://www.facebook.com/woopcover?sk...59237157423118
They are VERY new though, but might be worth a punt.