Here's the gear I finally settled on, picked it all up from OCUK and one competitor.
Corsair HX 520W ATX2.2 Modular SLI Compliant PSU (CMPSU-520HXUK)
Intel Core 2 DUO E6300 "LGA775 Allendale" 1.86GHz (1066FSB) - OEM
Tuniq Tower 120 CPU Cooler
Gainward BLISS GeForce 8800 GTS 640MB GDDR3 HDTV/Dual DVI (PCI-Express) - Retail
OCZ 2GB (2 x 1GB) PC2-6400 Dual Channel Platinum Revision 2 XTC Series DDR2 (OCZ2P800R22GK)
Asus P5N-E SLi nForce 650 (Socket 775) PCI-Express DDR2 Motherboard
Seagate 7200.10 320GB SATAII/300 8.5ms 7200rpm 16MB Cache - OEM
Totals: £673.94 exc. VAT, £791.88 inc. VAT.
I'll be getting the VAT back in April too
Pretty chuffed at getting this setup for under £700! Getting free delivery from competitor so i'll have to wait about 5 working days for it - yeah i'm tight :/ Ah well it'll be worth the wait i'm sure! 
Corsair HX 520W ATX2.2 Modular SLI Compliant PSU (CMPSU-520HXUK)
Intel Core 2 DUO E6300 "LGA775 Allendale" 1.86GHz (1066FSB) - OEM
Tuniq Tower 120 CPU Cooler
Gainward BLISS GeForce 8800 GTS 640MB GDDR3 HDTV/Dual DVI (PCI-Express) - Retail
OCZ 2GB (2 x 1GB) PC2-6400 Dual Channel Platinum Revision 2 XTC Series DDR2 (OCZ2P800R22GK)
Asus P5N-E SLi nForce 650 (Socket 775) PCI-Express DDR2 Motherboard
Seagate 7200.10 320GB SATAII/300 8.5ms 7200rpm 16MB Cache - OEM
Totals: £673.94 exc. VAT, £791.88 inc. VAT.
I'll be getting the VAT back in April too

