I have just built a personal computer of 270 pounds, but in shop you may find it for 500 pound or more. So if you have a knowledge of computer assembling, you should go on any of UK website that sells components, I recommend dabs.co.uk, order components you need and build it. It's easy see some videos on youtube how to do it. But be careful about choosing the right components. You definitely go with AMD APU, combine processor with graphic card, this one use socket FM2, so motherboard should have this socket.