Assuming PCPartPicker part list / Price breakdown by merchant
| Type | Item | Price |
|---|---|---|
| CPU | Intel Core i7-5820K 3.3GHz 6-Core Processor | £305.94 @ Aria PC |
| CPU Cooler | be quiet! Dark Rock 3 113.8 CFM Fluid Dynamic Bearing CPU Cooler | £43.14 @ Aria PC |
| Motherboard | Asus X99-S ATX LGA2011-3 Motherboard | £199.99 @ Amazon UK |
| Memory | Crucial Ballistix Sport 32GB (4 x 8GB) DDR4-2400 Memory | £275.99 @ Amazon UK |
| Storage | Crucial MX100 256GB 2.5" Solid State Drive | £74.09 @ Amazon UK |
| Storage | Seagate Barracuda 3TB 3.5" 7200RPM Internal Hard Drive | £79.14 @ Aria PC |
| Video Card | PNY Quadro K4200 4GB Video Card | £690.78 @ More Computers |
| Case | Lian-Li PC-9NB ATX Mid Tower Case | £89.99 @ Amazon UK |
| Power Supply | XFX XTR 550W 80+ Gold Certified Fully-Modular ATX Power Supply | £67.38 @ More Computers |
| Prices include shipping, taxes, rebates, and discounts | ||
| Total | £1826.44 | |
| Generated by PCPartPicker 2015-03-24 12:51 GMT+0000 |
i7-5820K, 32GB of DDR4 RAM, Quadro K4200.
All for £1826.
You can spend more on the CPU if you'd like (for a 5960X) or the GPU (for a Quadro K5000) and it'll still be less than 2500 pounds.
Feel free to spend more on the storage if you think it is necessary.
I would highly recommend you overclock the GPU for the best performance, but it's not a must by any means.