Really would recommend building the PC yourself, try watching some of these PC building videos.
It may seem daunting but really its just like Lego, PC parts are a lot more durable than they use to be
This way you will get a lot more for your money and it allows you to personalize the computer to your personal preference





But hey, if you really don't want to do this I can go off and find you a pre-built, shouldn't be hard to find one yourself actually

i used gladiatorpcs and wouldnt look back.

bought the apocalypse for 750

As @cookes said, build a computer. A few years ago I was on the same boat as you, wanting to buy a pre-built instead of building one. Mainly because I have never done it before and I didn't want to **** up and possibly waste a lot of money. Once you get into it, it is rather easy. You have to take some safety measures, but the parts aren't fragile, so don't worry about breaking them. The only thing that I didn't like out of it all, was the wiring. The wiring took me longer than usual and I needed a bit of help on it, but now that I have built my computer, I feel like building another one would be a breeze.

I hope you do build your own, best bang for the buck. People on here will help get you a nice PC part list and any advice you need.

Assuming you don't need any peripherals within budget, you should get this;
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RX 480 releases on June 29th, should see 4GB and 8GB variants of aftermarket 480s within a few days of release I'd imagine. £200 should be more than enough for a nice 8GB RX 480. XFire support so youd be able to add a 2nd 480 at any point if wanted/needed. i5, you can upgrade to an i7 at any point if you feel the need, Kaby Lake and the next architecture after that should be LGA1151 as well, so you could upgrade to the newest i7 in two generations with nothing other than a BIOS update. 8GB RAM is fine, but you should probably add another 8GB in the future, just when you have spare cash. Just because RAM is so inexpensive these days and a lot of applications/games are starting to make use of 16GB. Nice little cooler because stock cooler is ugly and loud. Nice case with built in LESs for +10 FPS. Fantastic quality power supply, based on one of the very best platforms on the market.