I've had some wicked quotes recently from Adrian Flux and also Lancaster Insurance.
http://www.adrianflux.com have a deal with Pistonheads that classes them as a car club getting you up to an extra 15% off (see /ph/ for more).
http://www.lancaster-ins.co.uk/ are an old-school classic insurance company. They don't take into account no-claims bonus because they just base their quote on you and how much you drive. Aside from that annoyance they seemed really good and **insanely cheap**. Bare in mind that if you don't use your no claims for two years you lose it.
Anyone else got any good ones?