What laptop should I buy?

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Ok right, I need a laptop to do my coursework on, this means it needs Microsoft office, needs a fast internet connection and I'm also doing computer science which means it needs to be able to do some sorts of computer programming. I'd also like to play games such as world of war craft etc and have good quality picture for videos and have a big memory space, I'm willing to spend up to £400 I realise that I'm more likely than not to have to compromise on some of these wishes. Many thanks