Much as I hate to, I disagree with rdave13... I've bought many (too many...) PCs for that amount or less, mostly from eBay, and have always found them more than adequate. If you're happy with eBay (and I've had over 500 successful transactions) then there are some great bargains to be had, and £200 will easily get you a Dell or HP with the kind of spec you mention. See here for example. Or here.
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