Hi, just went to my local blockbuster and noticed this. I know the deal has been posted about the 360 games but I couldn't find anything about the Wii deal.
Basically ANY Wii game (including resi 4) is £9.99 when you trade in:
Bust a Move
Legend of the Dragon
Mortal Kombat: Armageddon
Pangya! Golf with Style
Scarface for the Wii is out on friday which is meant to be a cracker, Legend of the Dragon can be had online at powerplay for £15.49 making it around £25.
Hope this is useful to someone :)