I've got quite an expensive car and the insurance is up for renewal. Current insurer (Direct Line) £670 Cheapest (Norwich Union) £270 But, when I add my girlfriend who is younger and not been driving too long: Direct line - £2,100 Norwich Union - won't quote Admiral (cheapest on price comparison site) - £552 So, Direct Line, Admiral, Norwich Union etc. etc. Does it really matter who insures me? Interested to know anyone's thoughts or experiences.