I've spoken to my dealer friend, and he had the following to say:
it's not a totally reliable check on HPI - it only needs someone to input a mileage incorrectly when they are checking a car and it throws it off
Try an MOT history check here
https://www.gov.uk/check-mot-history-vehicleYou will need the V5 doc ref no. which is 11828442371 and the reg number X589 UAY.
Many thanks
Alan
Alan Shacklock