heres the most common ones,incorrect record held by dvla-given you can look it up it will most likely be the vin thats wrong.second,recent transfer from a private reg,third,private import/not registered/hid in a barn for the last few years,fourth,old or oddball motor that they dont wanna get involved with and this seems like a good excuse to death it out,fifth ringer or clone,sixth,previous new record created with wrong details.first check the vehicle vin closely against the details on your logbook(17 digit no)cos thats the most likely.any difference means the system wont recognise it.