Shop around, get quotes, like for like policies, go back to CN and tell them you've got it cheaper tell them who, how much. Either they beat, get very close or you insure elsewhere.I've been doing the above for years, I've never paid their renewal quote ever. this year CN wanted to increase mine by £70 and switch me to another insurer wit £300 more excess. Got it back to last year price and only £50 more excess, I've been with CN for well over 20yrs. Many yearly cover suppliers, RAC, AA, Phones etc love people who just renew, why because they can screw you! Also look out for the auto renew schemes, yes they stop you having to worry, but they renew (ie they take the money) about 5 days (can be more) before the actual renewal date. If you don't do the above before the auto pay date, you'll have reduced your bargaining power e.g. you may get a refund, but perhaps not a reversal in say increase in excess. Why because you've already bought the policy. You could cancel which may or may not have a fee and then re-quote for a new policy, if the fee is a fair bit less than the difference between a new policy, probably worth it cancelling. That said some don't, my car insurer always is either cheaper than last year or the same, mostly it's been cheaper.