DVLA often have errors on their system. It took a while to correct the computer system to match the V5 as it had my Series 4 listed as a manual on the computer system (HPI) but was built as an auto.
The V5 showed date of first registration as 01/01/09 and yet the police computer system said 31/12/08.
And of course the DVLA data on the GTN's is incorrect too! That is down to Morgan though :-)
