Use the code 15MAY-1 at the checkout. You can also use the code MAYOFFER-1 for 300 extra clubcard points. Some pre-orders you might like: Duke Nukem Forever Xbox 360 Call of Duty: Modern Warfare 3 Xbox 360 Gears of War 3 Xbox 360 I pre-ordered Duke Nukem Forever for £29.49, you can only use the codes once per account.
I would like to just mention that you cannot use the 300 (£3) vouchers on anything on Tesco Entertainment