Stumbled across this although cant find it on clubcard website (its under terms and condinitions for £50 promotion)http://www.tescofinance.com/personal/finance/insurance/carins/important-info.html
im assuimg you can get £50 cashback and pay in clubcard points awesome seems too good to be true
Paying with Clubcard vouchers
To use Clubcard vouchers to pay for Car Insurance you must pay the premium in full and redeem your voucher afterwards. This is fully explained in the Welcome pack.
Once you've paid your premium, or your first instalment has been received, we'll send you a pre-filled form and envelope for you to return your vouchers to us. Once we have them, we'll refund their value into the account used to pay your premium.
The maximum amount of Clubcard vouchers you redeem cannot be greater than the premium stated on your redemption form. Clubcard vouchers must be valid and in date and must not be damaged, defaced, copied or altered. The policyholder must have a Clubcard in their own name.
Tesco Insurance accept no responsibility for Clubcard vouchers that are not received. Any change from your Clubcard vouchers will be credited to your Clubcard account and be advised to you in your next Clubcard statement. Please note that you can only redeem Clubcard vouchers against your annual premium once a year. All money will be refunded into the payment method specified on your redemption form. Every £1 voucher redeemed will be redeemed as £1 of payment for your insurance premium.
(EDIT NOT A GOOD DEAL (USING VOUCHERS) AS ONLY FACE VALUE OF VOUCHERS GIVEN NOT X 4 LIKE NORMAL CLUB CARD DEALS)