ExOArTiE :
Chillblast do quite good prebuilt PC's.
http://www.chillblast.com/
Chillblast seems good. Just checked them out.
I live in Singapore so I didn't know how much 1500 Pounds was until I saw you could get this specs within this budget:
http://www.chillblast.com/Chillblast-Fusion-Pandora-Gaming-PC.html
BitFenix Pandora Micro-ATX Case
Intel Core i7 5820K overclocked to 4.2GHz
H100 Water Cooler
Geforce GTX 980 4GB Video Card
X99M-Gaming 5 Gigabyte Motherboard
16GB 2133 DDR4 Memory
250GB Samsung 850 EVO SSD
2000 GB 7200rpm HDD
Corsair AX760 PSU
Windows 8.1 64 bit
Holy crap, this is good! But, I have no idea what 'VAT' is, but with 'VAT' ,this goes up to 1789 pounds. But if you can get this, this will easily last you another good 5 -6 years.