we had a renewal quote for £571 for our 10 year old car. went via moneysupermarket/quidco to find cheaper price and found one quote from existing company at £221 (£10 more than next cheapest with another company).
Called company and asked why on earth new customer quote was so much lower than renewal - they told me they could renew it at the lowest price and would raise it as it was soo much less. But the really nice woman also suggested that I go via quidco to get my £40 new customer cashback by buying on line! So, £350 less plus £40 cashback - almost enough to book a summer camping holiday - will be doing this with each and every insurance from now on!
(took about 2 hours all told)