You are in the dark ages of budget gaming. But I would not go with your build. If it were me I would go with the AMD 2400g APU and get a GPU when prices are more reasonable.
PCPartPicker part list:
https://uk.pcpartpicker.com/list/M746MZ
Price breakdown by merchant: https://uk.pcpartpicker.com/list/M746MZ/by_merchant/
CPU: AMD - Ryzen 5 2400G 3.6GHz Quad-Core Processor (£131.94 @ Aria PC)
Motherboard: MSI - B350M GAMING PRO Micro ATX AM4 Motherboard (£65.97 @ Ebuyer)
Memory: G.Skill - Ripjaws V Series 8GB (2 x 4GB) DDR4-3200 Memory (£109.36 @ Alza)
Storage: Seagate - BarraCuda 1TB 3.5" 7200RPM Internal Hard Drive (£33.95 @ Aria PC)
Case: BitFenix - Nova ATX Mid Tower Case (£25.19 @ Aria PC)
Power Supply: Corsair - CXM (2015) 450W 80+ Bronze Certified Semi-Modular ATX Power Supply (£57.21 @ Ebuyer)
Total: £423.62
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-02-19 16:04 GMT+0000