£700 Build Advice

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I don't understand how the build you posted comes to £700?

Here's a few UK websites worth checking for the best prices:
www.ebuyer.co.uk
www.scan.co.uk - take advantage of their Today Only Deal's
www.amazon.co.uk

Ok so lets take a look at your build:

CPU: Fine - although might be worth looking at an after-market CPU cooler too if you plan to overclock
Mobo: Fine - although you could consider a cheaper B75/H77 motherboard
GPU: Fine (although I would maybe consider an AMD 7xxx series or Nvidia 6xx series)
SSD: Nice for Boot Drive, 30GB will fit OS and an application or 2.
HDD: WD is a solid manufacturer, however make sure you grab a 7200RPM HDD, the Green Drives are much slower 5400RPM. Caviar Blue is a good choice - if you don't NEED 1TB of storage space, don't pay for it, 500GB is currently at a nice price. You can always buy another in the future when HDD prices drop to where they used to be.
RAM: Make sure to get Dual Channel, DDR3, 1600MHz (faster than the 1333MHz you listed), 1.5v, CL9. Corsair Vengeance (or low Profile) is probably your best choice in the UK.
Optical: Own this myself and am really pleased. However bare in mind it doesn't come with Software which will allow you to play Blu-Ray disks.


Now Case and PSU...

For PSU, make sure you get something with an 80PLUS rating of Bronze or higher. In the UK one of the best value units is the "XFX Core Edition 550w Bronze" - this would be perfect for your build. You might pick up a cheap deal on something else, but make sure it has an 80PLUS rating of Bronze.

Cases - There's some good value options out there, don't sink too much of your budget, you can get a perfectly good case for around £30-40. Have a look through some of these: http://www.scan.co.uk/shop/computer-hardware/all/cases-...

Since he is getting an SSD, usually it would have been that Caviar Green is good for storage. However, since you are getting an SSD that wont fit many programs, get a Seagate Barracuda 500GB HDD..