In the recorded crime statistics, thefts of a motorbike cannot be separately identified from other vehicle thefts. Some statistics for motorbike thefts were published in the Bike Theft Index 2005. A copy of this document is available at:
http://www.secureyourmotor.gov.uk/downloads/biketheftlores.pdf
Home Office Findings 269 entitled ‘The extent of motorcycle theft’ gives national statistics for 2001-03 and is available at:
http://www.homeoffice.gov.uk/rds/pdfs05/r269.pdf