What could I change in this build?

Solution
A reliable PSU , 2X4 on the ram for Dual Channel mode , better board.

PCPartPicker part list / Price breakdown by merchant

CPU: AMD FX-6300 3.5GHz 6-Core Processor (£78.77 @ CCL Computers)
Motherboard: Gigabyte GA-970A-UD3P ATX AM3+ Motherboard (£59.98 @ Amazon UK)
Memory: Kingston HyperX Fury Black 8GB (2 x 4GB) DDR3-1600 Memory (£32.84 @ Amazon UK)
Video Card: Asus Radeon R9 380 4GB Video Card (£169.99 @ Novatech)
Case: Corsair SPEC-01 RED ATX Mid Tower Case (£41.41 @ CCL Computers)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply (£51.36 @ CCL Computers)
Total: £434.35
Prices include...
A reliable PSU , 2X4 on the ram for Dual Channel mode , better board.

PCPartPicker part list / Price breakdown by merchant

CPU: AMD FX-6300 3.5GHz 6-Core Processor (£78.77 @ CCL Computers)
Motherboard: Gigabyte GA-970A-UD3P ATX AM3+ Motherboard (£59.98 @ Amazon UK)
Memory: Kingston HyperX Fury Black 8GB (2 x 4GB) DDR3-1600 Memory (£32.84 @ Amazon UK)
Video Card: Asus Radeon R9 380 4GB Video Card (£169.99 @ Novatech)
Case: Corsair SPEC-01 RED ATX Mid Tower Case (£41.41 @ CCL Computers)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply (£51.36 @ CCL Computers)
Total: £434.35
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-11-20 18:16 GMT+0000
 
Solution