Maybe something like this. It's 583 Euros = 425.003028 British pounds (if your prices are not to different)
Antec NSK4480B € 64,75 € 64,75
Club3D Geforce 8600 GTS 256MB DDR3 (PCI-e, 2x DVI) CGNX-GT... € 129,95 € 129,95
Gigabyte GA-P35-DS3R € 94,- € 94,-
Intel Core 2 Duo E6750 € 149,- € 149,-
Kingston KVR800D2N5K2/2G € 37,96 € 37,96
Samsung SH-203N € 25,88 € 25,88
Samsung SpinPoint T166, 500GB (7200rpm, SATA II, 16MB, NCQ) € 82,- € 82,-