Have a look at:
http://www.dvla.gov.uk/vehicles/exptimpt.htm It seems the rules changed in last year.
Also there's currently a thread on visordown (general) entitled Importing bikes
http://www.visordown.com/forums/show...hreadid=139768 which should help with some of the practical problems.
Good luck!
Edited to say: if you do need help with sorting out how much import duties, VAT etc would be, I have a mate who does this (ie provides this sort of advice) for a living. Obviously you'd need to sort out a fee with him, but U2U me if you need contact details.
[Edited on 3-1-2004 by lizzie]