HMV sells many Wii titles for £34.99. To get the order to just over £35 to use a £5 off £30 voucher, I suggest that you add Uefa Champions Of Europe: Trading Cards which cost 35p. With a voucher, this takes your order to £30.34. Once your game is dispatched you will be charged £29.99 and you can then cancel the trading cards.
Remember to use Quidco!