Well. First of all, you have chosen a CPU that doesn't support overclocking, while your motherboard supports it. You could save some £ by going with a H97 motherboard instead. You could probably save some money on the PSU, too (with a non-modular Bronze unit, for example), but your choice isn't bad.
So, here's my suggestion: PCPartPicker part list / Price breakdown by merchant
| Type | Item | Price |
|---|---|---|
| CPU | Intel Core i5-4590 3.3GHz Quad-Core Processor | £149.62 @ Amazon UK |
| Motherboard | MSI H97M-E35 Micro ATX LGA1150 Motherboard | £58.76 @ Scan.co.uk |
| Memory | Kingston 8GB (1 x 8GB) DDR3-1600 Memory | £34.77 @ Ebuyer |
| Storage | Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive | £32.40 @ Aria PC |
| Video Card | XFX Radeon R9 280X 3GB Black Edition Double Dissipation Video Card | £208.41 @ Amazon UK |
| Case | Cooler Master N300 ATX Mid Tower Case | £32.11 @ Amazon UK |
| Power Supply | EVGA SuperNOVA NEX 650W 80+ Gold Certified Fully-Modular ATX Power Supply | £63.31 @ Amazon UK |
| Optical Drive | Lite-On iHAS124-14 DVD/CD Writer | £9.96 @ Aria PC |
| Prices include shipping, taxes, rebates, and discounts | ||
| Total | £589.34 | |
| Generated by PCPartPicker 2015-07-07 17:43 BST+0100 |
The video card is quite possibly the best bang for your buck right now. While not super-duper-high-end 4K ready 144hz supportive card, it will still provide you with a good experience in 1080p, especially while on your budget.