Ok its a little complicated but worth it for the saving
Order 5 wii games from game getting 5 free (needs to be dogz or tony hawks) costing £137.50 (not including 11% quidco)
cex will give you £18 credit for each game (making it £36 for your £27.50 spend)
doing it 5 times will cost you £137.50 but you will have £180 credit to spend at cex.
wii costs £170 with them so you will be able to get a cheap game too.