Is this a good build for Gaming? (£560)

It would only be half-decent if you were running a pretty low resolution and/or turning the settings way down. For £560 you can do much better building it yourself.

CPU: AMD Athlon II X3 440 3.0GHz http://www.ebuyer.com/product/191955 £62

Mobo: Gigabyte GA-MA770T-ES3 http://www.ebuyer.com/product/194682 £55

RAM: Kingston DDR3 2GB 1333MHz i5 Memory Module CL9 1.5V http://www.ebuyer.com/product/147903 £41 Will be easy to add another set later when you have a bit more money. Meanwhile you will get passable performance. Better to just start off with one 2GB stick as even after you go up to 4GB you will still have the further upgrade option of going to 8.

GPU: Palit GTX 460 768MB http://www.ebuyer.com/product/227181 £150
Much more powerful graphics card than the one in that link, which is the most important component for a gaming rig.

Case & PSU: CoolerMaster Elite 330 With CoolerMaster Extreme Power Plus 460W http://www.ebuyer.com/product/135101 £56

HDD: Either of these:
Samsung Spinpoint F3 500GB http://www.ebuyer.com/product/146252
Seagate Barracuda 7200.12 500GB http://www.ebuyer.com/product/158860
~£35
If you need 1TB, get the 1TB version of either of those, should cost ~£55.

Optical Drive: Any SATA DVD ~£15

OS: Windows 7 64bit Home Premium OEM http://www.ebuyer.com/product/173791 £79

Total: £492