You need to register on the club card website and all of your valid vouchers will be available, select how many you want to use on Eurotunnel and you'll get a voucher code to use when you call Eurotunnel to make the booking, If you convert £40 of vouchers to £120 of Eurotunnel vouchers they will convert the odd £6 back into clubcard vouchers for you when you make the booking, I didn't realise this last year and put the odd £14 on a debit card.
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