Just found this and thought I'd let you know about it.
Pre order MW2 from Argos and use code: Game20 for a 20% discount
I should think so too if they're charging £45 for a game pre-order. It'll be on shelves the release day for probably £36-£40, and maybe just over £30 a week later with the way game prices are heading.
Thanks for the heads up though, keep them coming.