This might not be great for everyone if you keep on top of your tesco discounts, however - I've little doubt some of you are a bit like me and have forgotten Tesco's love :)
Simply goto the link posted, you'll need your tesco card handy to log in. Be sure to enter the whole number, including the 634004 - don't put any spaces in.
Then click "Your Vouchers" on the right and hand side and see what you have/haven't used. If you want your unused vouchers reissuing TO SPEND INSTORE - simply call 0800 59 16 88 - with the voucher reference from your login. To spend online simply copy the code and paste it at checkout.
Being forgetful I've just landed 12 months xbox live and 2100 point for £26 - nearly 50% less than I would have paid - happy days!
For people that have moved houses/emails address' its worth checking and correcting your contact details to :)
ps. This was posted in the free section but after several people found money they'd not claimed I thought it'd be worth posting here, apologies to the mods if this isn't in the right place :(
Alternative to the 0800 number : 01382 822200