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AMD Sempron SI-40 Processor
(2 GHz, 512 KB Cache)
NVidia Geforce 8200M Graphics 15.4" display
Genuine Windows Vista (R) Home Basic
1 GB Memory
120 GB Hard Drive
This seems a good deal rather than a great deal and if your budget is £250 then there isn't much choice and this looks to have a good combination of features although of course it is "refurbished" but then it is a reasonable make.
Sempron processors aren't great but in this case this is made up for by the graphics card which I believe is DirectX 10 compatible. Mind you it's nothing special, equivalent to Intels latest X4500 integrated offering but significantly better than the X3100 (which itself is very significantly better that the X950 and Mirage 3+).
Reviews of this model suggest battery life isn't great so may not be for you if that's important.