Duty 10%
 VAT 17.5%
 Registration Fee - Can't remember about £90 I think
 SVA £70
 You may need to acquire a model report as well for the SVA, should be fairly straightforward to convert a bike (cars are a nightmare..) 
 Info on importing here  
http://www.vosa.gov.uk/vosa/motorcyc...ngvehicles.htm  and here  
http://www.dft.gov.uk/stellent/group...pdf_506867.pdf