Hows this
PCPartPicker part list:
http://uk.pcpartpicker.com/p/SYW8
Price breakdown by merchant: http://uk.pcpartpicker.com/p/SYW8/by_merchant/
Benchmarks: http://uk.pcpartpicker.com/p/SYW8/benchmarks/
CPU: Intel Core i5-3570K 3.4GHz Quad-Core Processor (£167.99 @ Aria PC)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler (£24.49 @ CCL Computers)
Motherboard: ASRock Z77 Extreme4 ATX LGA1155 Motherboard (£105.35 @ Amazon UK)
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory (£41.77 @ Amazon UK)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive (£45.99 @ Ebuyer)
Video Card: Sapphire Radeon HD 7870 XT 2GB Video Card (£193.40 @ Amazon UK)
Case: Corsair Carbide Series 300R Windowed ATX Mid Tower Case (£69.99 @ Amazon UK)
Power Supply: XFX 550W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply (£52.28 @ Amazon UK)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer (£11.66 @ Amazon UK)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) (£68.39 @ Aria PC)
Monitor: Asus VE248H 24.0" Monitor (£157.49 @ Ebuyer)
Total: £938.80
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-04-25 18:29 BST+0100)
If I converted it right its just over 1100, not sure if shipping will cost any more.