Finally conceded and placed an order for a new PC from www.pcspecialist.co.uk and I have gone well over the top with the spec:
Core i7 940 (4 x 2.93 Ghz)
6 GB Corsair DDR3 1600 Mhz RAM
300 GB VelociRaptor 16 MB cache (10,000 RPM)
1 TB HDD
1GB Nvidia Geforce 9800 GT
64 bit Vista Home Pro
all in a Black Trigon Case.
Total Spend £1,500 (inc VAT)
Delivery is about 7 to 10 days ;-)