I posted this the last time the 15% off code was active so worth posting again!
Using code T15OFF25 you can get 15% off a tesco e-voucher. Once you buy the e-voucher, log into the account you sent the e-voucher too and choose the item you want. Add the code to take 15% off and then use your e-voucher.
Here is an example -
Buy a £30 e-voucher for £25.50
Using the account you sent the e-voucher to, add an item to you basket. For example Marvel blu ray box set for £39.97. Use the discount code 15off25 to make it £33.98
Pay using the £30 e-voucher leaving £3.98 to pay by card
Total cost of the box set £29.48 (£25.50 spent on voucher and £3.98 left to pay by card), over £10 saved!
I havent tried it but I think you could potentially buy the 3DS XL for around £130 using this trick. The discount takes £26.50 off the console making it £148.72 so you need to buy £150 worth of e-vouchers for £127.50.
PLEASE NOTE THAT E-VOUCHERS DO NOT WORK FOR PRE-ORDERS.