Okay, below is a build, slightly over £1000. But I question your choice of an i7-6700K on two fronts. First, why do you need an i7? Most games will play just fine with an i5, TomsHardware still questions the need for 8 threads for gaming. You get into diminishing returns past an i5.
Second, and maybe more to the point, do you intend to overclock? Because if you don't, then there is no use in buying a "K" processor and the associated hardware. Some significant money can be saved here.
Last comment, a single GTX 980 Ti is pretty close in performance to dual SLI 970's. It pushes the build up by £250 but it gives you future expansion capability of another in SLI. But the money may be talking here.
PCPartPicker part list:
http://uk.pcpartpicker.com/p/z6XH6h
Price breakdown by merchant: http://uk.pcpartpicker.com/p/z6XH6h/by_merchant/
CPU: Intel Core i7-6700K 4.0GHz Quad-Core Processor (£299.99 @ Ebuyer)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler (£25.98 @ Ebuyer)
Motherboard: Asus Z170-A ATX LGA1151 Motherboard (£120.12 @ Amazon UK)
Memory: G.Skill Ripjaws 4 Series 8GB (2 x 4GB) DDR4-3000 Memory (£52.21 @ More Computers)
Storage: A-Data Premier SP550 240GB 2.5" Solid State Drive (£54.99 @ Ebuyer)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive (£37.98 @ Novatech)
Video Card: MSI GeForce GTX 970 4GB Twin Frozr V Video Card (£276.98 @ Amazon UK)
Case: Corsair 200R ATX Mid Tower Case (£50.82 @ Amazon UK)
Power Supply: EVGA SuperNOVA G2 650W 80+ Gold Certified Fully-Modular ATX Power Supply (£74.99 @ Amazon UK)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer (£11.48 @ Amazon UK)
Operating System: Microsoft Windows 10 Home OEM (64-bit) (£75.99 @ Ebuyer)
Total: £1081.53
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2016-02-10 16:24 GMT+0000