PCPartPicker part list:
http://uk.pcpartpicker.com/p/LbgFLk
Price breakdown by merchant: http://uk.pcpartpicker.com/p/LbgFLk/by_merchant/
CPU: Intel Core i5-4460 3.2GHz Quad-Core Processor (£138.31 @ CCL Computers)
Motherboard: ASRock Z97 Anniversary ATX LGA1150 Motherboard (£58.76 @ Scan.co.uk)
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory (£40.90 @ Scan.co.uk)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive (£32.40 @ Aria PC)
Video Card: Zotac GeForce GTX 970 4GB Video Card (£247.90 @ Aria PC)
Case: NZXT Source 210 (Black) ATX Mid Tower Case (£24.90 @ Scan.co.uk)
Power Supply: Antec TruePower Classic 550W 80+ Gold Certified ATX Power Supply (£51.93 @ Dabs)
Total: £595.10
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-07-05 21:14 BST+0100
this is under budget but the one above is still quite a bit better.