Here it is - http://www.ebuyer.com/product/199196
My price limit is just about 450-500 pounds. And I'd like to be able to play stuff like sc2 or cod6, but if it's not possible for that price, I'll have to live with it.
Hmm..I think you'll be fine. I have a desktop GDDR3 5450 and I can play Crysis on mostly medium settings at 1280 x 800. A desktop 5450 should be similar to a 5470 laptop version. Since laptop screens are similar you could probably run both COD6 and SC2 at medium settings @ 1024 x 768 fairly smoothly since both those games shouldn't be more demanding then Crysis.
54xx series is good for multimedia and some light gaming, it's not that bad