Thanks to all for your comments and hints on other suppliers to 
consider; in particular I shall have a further look at 
www.vadim.co.uk 
to see what it would cost to configure a machine to my liking.
To explain the "pocket money" bit further: my wife and |I have an 
agreement that *her* state pension and pension from BT are *her* money, 
to do with as she wants, and *my* state pension and the money I earn 
from oddments of consulting are *my* money (hence "pocket money"; the 
"housekeeping" is the pensions from my two former employers.
I spent an hour or so earlier this week, poring over the information on 
the Evesham, Hi-Grade, Mesh and Novatech web sites, to build up a table 
comparing the exact configurations of an Intel quad core system from 
each. It was quite revealing, and if anyone would like a copy I can send 
it to them - mail me off list. There were fairly clear gaps in the 
pricing, with the Hi-Grade system coming in cheapest at around £2150, 
then Evesham and Mesh very close together at about £2450, and Novatech 
at a bit over £2710 (the higher price of the Novatech is probably 
accounted for by the higher spec of the graphics card: 2 x nVidia 
8800GTX, whereas Evesham and Mesh both use single nVidia 8800GTX and the 
Hi-Grade uses a twin nVidia 7950GX2.
It'll be a little while yet before I get paid, so I shall have time to 
do some more digging around (and do another column on my comparison 
table for a system from 
www.vadim.co.uk)!
Happy Christmas to all
Ian
-- 
Ian Park
17 Pyle Hill
Newbury
Berkshire
RG14 7JJ
Tel: +44 (0)1635 821420
GSM: +44 (0)7785 300290
email: ian@???