Try checking on Ebuyer. From what I see, that's the go to site in the UK.
If it's still over the budget, try dropping the CPU down to the X4 635. Or if you don't want the option to Crossfire later, drop the PSU down to a 450-550W (stick with Antec, Corsair, Silverstone, or SeaSonic) and pick up the Gigabyte GA-770TA-UD3. I would also look at some other cases to cut the price a little: Antec 300, Antec 300 Illusion (if available over there), Coolermaster Centurion 5, and Coolermaster Elite.
The first thing I would look at is changing the case. After that, if you don't plan on getting a higher resolution monitor in the next year or two, eliminate Crossfire. If you do plan on a new monitor or don't use Photoshop too much, down grade the CPU.