Z87 Board and no K CPU? Makes no sense to me since the K version is just 5£ more. Also the board seems a bit expensive, I took a cheaper one and got a better GPU for it.
@Neko you should build the PC on your own. It saves you a lot of money and is a good experience. There are plenty of moron-safe tutorials on youtube.
http://uk.pcpartpicker.com/p/3ztln
This build is 50£ more than your budget (770) but is shipping price free and covers up pretty much everything except windows, I even got you an USB wifi card.
The CPU is the same but overclockable so you can squeeze performance out.of it if it's not fast enough anymore in some years.
The RAM is unnessecary fast tbh but it was cheaper than normal 1600Mhz RAM.
The GPU is good enough to play BF4 on ultra (without antialaising) at about 60FPS.
Power supply is about 100W more than you need so it's useable if you upgrade your GPU in the future. Some people in here recommanded a Seasonic, but BeQuiet! uses the same technology.
The optical drive is a standard DVD Burner, sums up everything unless you want to burn blu rays.
The monitor is a standard full HD monitor with HDMI, DVI-D and VGA, nothing special.
Talking about peripherals, these are a good shot. The Keyboard is pretty decent if you're not a heavy makro user plus it got special rubberized WASD keys. The Mouse is a pro gaming mouse which is used by clans like Fnatic and SK Gaming. You could upgrade the headset to some high quality headphones and add a clip microphone from Zalman.
The case is good for building a PC on your own, I already built 2 PC's with it.