Very nice parts list, especially for a beginner. Not much that I would change here, other than the SSD. I'm assuming that you're buying one for your OS and online games to make them faster, and if you are, I would recommend atleast 250 GB.
PCPartPicker part list:
https://uk.pcpartpicker.com/list/yctfCy
Price breakdown by merchant: https://uk.pcpartpicker.com/list/yctfCy/by_merchant/
CPU: Intel Core i5-7600K 3.8GHz Quad-Core Processor (£217.20 @ Aria PC)
CPU Cooler: be quiet! Dark Rock 3 67.8 CFM Fluid Dynamic Bearing CPU Cooler (£56.42 @ More Computers)
Motherboard: MSI Z270 SLI PLUS ATX LGA1151 Motherboard (£133.97 @ Amazon UK)
Memory: Corsair Vengeance LPX 16GB (2 x 8GB) DDR4-3000 Memory (£113.39 @ Aria PC)
Storage: Plextor M7V 256GB 2.5" Solid State Drive (£63.99 @ Amazon UK)
Storage: Toshiba 3TB 3.5" 7200RPM Internal Hard Drive (£76.56 @ Aria PC)
Video Card: Asus GeForce GTX 1070 8GB Video Card (£359.99 @ Amazon UK)
Case: Phanteks ECLIPSE P400S TEMPERED GLASS ATX Mid Tower Case (£79.99 @ CCL Computers)
Power Supply: XFX XT 600W 80+ Bronze Certified ATX Power Supply (£50.32 @ CCL Computers)
Operating System: Microsoft Windows 10 Home OEM 64-bit
Total: £1151.83
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-03-20 19:36 GMT+0000
It keeps your all-black theme and gets you a 256GB SSD, and is a couple bucks cheaper.