PCPartPicker part list:
https://uk.pcpartpicker.com/list/JfswM8
Price breakdown by merchant: https://uk.pcpartpicker.com/list/JfswM8/by_merchant/
CPU: Intel - Core i5-8600K 3.6GHz 6-Core Processor (£198.34 @ Amazon UK)
CPU Cooler: Noctua - NH-D15 82.5 CFM CPU Cooler (£83.73 @ Kustom PCs)
Motherboard: ASRock - Z370 Pro4 ATX LGA1151 Motherboard (£108.27 @ Amazon UK)
Memory: Corsair - Vengeance LED 16GB (2 x 8GB) DDR4-3000 Memory (£179.99 @ Amazon UK)
Storage: Samsung - 850 EVO-Series 500GB 2.5" Solid State Drive (£123.54 @ Aria PC)
Storage: Seagate - FireCuda 1TB 3.5" 7200RPM Hybrid Internal Hard Drive (£59.97 @ Amazon UK)
Video Card: EVGA - GeForce GTX 1080 8GB Superclocked Gaming ACX 3.0 Video Card (£524.99 @ Ebuyer)
Power Supply: SeaSonic - FOCUS Plus Gold 650W 80+ Gold Certified Fully-Modular ATX Power Supply (£94.99 @ Amazon UK)
Total: £1373.82
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-01-05 17:13 GMT+0000
I didnt include a case or OS.