Ok, sorry for the delay in replying, here's what I've found out:
I'm using squeeze with a 2.6.32-5-686 kernel.
Adding this to the xorg.conf;
Section "ServerFlags"
Option "AutoAddDevices" "False"
EndSection
results in the USB mouse not working or keyboard. I've since removed this.
However, problem seems to have resolved itself,
Thank you very much for all your help,
James