15% off Video Games | CD's | DVD's | Blu Rays @ Zavvi
Instructions: Britvic are currently running a promotion where you can enter codes from their products on at the website www.rewardyourthirst.com with the chance of winning prizes.
I've noticed that if you set up an account on the site you can recommend up to 10 friends*, with each recommendation earning you 1 point. Once you've earned 3 points, you can then redeem them for a 15% off code for Zavvi.
* Of course, if you don't have 10 mates, you could always make them up (well.... at least create some email addresses for the imaginary friends)