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PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i7-4790K 4.0GHz Quad-Core Processor (£269.94 @ Aria PC)
Motherboard: Gigabyte GA-Z97X-SLI ATX LGA1150 Motherboard (£89.99 @ Novatech)
Memory: Kingston Fury White Series 16GB (2 x 8GB) DDR3-1866 Memory (£94.02 @ CCL Computers)
Storage: Crucial BX100 250GB 2.5" Solid State Drive (£74.52 @ CCL Computers)
Storage: Seagate Barracuda 2TB 3.5" 7200RPM Internal Hard Drive (£53.94 @ Aria PC)
Video Card: MSI GeForce GTX 980 4GB Video Card (£429.98 @ Novatech)
Case: Zalman Z11 ATX Mid Tower Case (£47.20 @ Amazon UK)
Power Supply: Corsair CSM 650W 80+ Gold Certified Semi-Modular ATX Power Supply (£66.99 @ Amazon UK)
Optical Drive: Samsung SH-224DB/BEBE DVD/CD Writer (£10.16 @ CCL Computers)
Operating System: Microsoft Windows 8.1 (OEM) (64-bit) (£76.50 @ Amazon UK)
Total: £1213.24
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-05-03 17:28 BST+0100

Seems like it's about right, I don't love the PSU. But it's a good deal for a fully-assembled machine with free shipping. I wouldn't worry about how much you can trust them, Paypal's buyer protection is solid.