Can someone recommend some UK sites where I can order my components?
http://www.ebuyer.com/customer/home/...273110&stid=1&

http://www.overclockers.co.uk

http://www.quietpc.com/uk/

[edit]
and a magazine that is just for the self build brigade:

http://www.custompc.co.uk/

top notch mag, great articles, full of ideas and sites.