Good spot, I thought I had deleted the ASRock board. No, doesn't necessarily have to be mATX. I knew inevitably I would forget something, but a PSU... Noob mistake.
Part list you have put looks better than mine. What do you think to the changes I made to it?
PCPartPicker Part List
Type
Item
Price
CPU
AMD - Ryzen 5 2600 3.4 GHz 6-Core Processor
£130.97 @ CCL Computers
Motherboard
MSI - B450 TOMAHAWK ATX AM4 Motherboard
£89.98 @ AWD-IT
Memory
Corsair - Vengeance LPX 16 GB (2 x 8 GB) DDR4-3200 Memory
£84.98 @ CCL Computers
Storage
Crucial - MX500 500 GB 2.5" Solid State Drive
£61.19 @ Amazon UK
Video Card
Gigabyte - GeForce RTX 2070 8 GB WINDFORCE Video Card
£449.68 @ Box Limited
Case
NZXT - H500 ATX Mid Tower Case
£69.98 @ AWD-IT
Power Supply
Corsair - RMx (2018) 550 W 80+ Gold Certified Fully Modular ATX Power Supply
£74.99 @ AWD-IT
Prices include shipping, taxes, rebates, and discounts
Total
£961.77
Generated by PCPartPicker 2019-05-19 13:12 BST+0100