When renewing, use comparison sites such as confised.com or moneysupermarket, average savings are around £200. Don't over estimate your mileage and adding immobiliser or keeping car garaged will reduce premiums. If you can pay the insurance in a lump sum rather than instalments. If your car is an old banger (with low value) consider TPFT (third party fire and theft) only cover which should reduce your prem. further.
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