Thought I'd put both your answers together. How's this?
PCPartPicker part list:
http://uk.pcpartpicker.com/list/WXPwYr
Price breakdown by merchant: http://uk.pcpartpicker.com/list/WXPwYr/by_merchant/
CPU: Intel Core i5-6500 3.2GHz Quad-Core Processor (£174.99 @ Amazon UK)
Motherboard: MSI B150M MORTAR Micro ATX LGA1151 Motherboard (£70.99 @ CCL Computers)
Video Card: Gigabyte GeForce GTX 1060 6GB 6GB Mini ITX OC Video Card (£232.38 @ More Computers)
Power Supply: SeaSonic 520W 80+ Bronze Certified Fully-Modular ATX Power Supply (£64.98 @ YoYoTech)
Total: £543.34
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2016-10-03 22:55 BST+0100