I've just ordered:
Antec 900 Case
520W Corsair HX Series Modular PSU
Logitech G5 Laser Mouse, 2000dpi mouse
512MB Gainward 8800GTS, Bliss Graphics Card
4GB (2x2GB) Corsair TwinX XMS2, DDR2 RAM
Microsoft Windows Vista Home Premium OS
Toshiba/Samsung TS-H653, 20x DVD±R Optical Disk Drive
Intel Core 2 Quad Q6600 G0 SLACR CPU
22" Daewoo L2200MD ,Black , Widescreen Monitor
Edimax EW-7728In 802.11n PCI Network Card
250 GB Western Digital WD2500AAKS Caviar SE16, SATA II, 7200 rpm, 16MB Cache, 9 ms HDD
Gigabyte GA-P35-DS3L, iP35 Express, S 775, PCI-E (x16), DDR2 1066/667/800, SATA II, ATX Mobo.
TOTAL - Around £850ish
Hopefully I (with the help of some forum members) made some good choices.