It is a legal requirement to notify your Passport Issuing Organisation (PIO) of changes to the information in the passport. 

If this has not been done you should ask the current owner of the equine why they haven’t updated their information with the issuing PIO. You can also ask them to do
this and you will be able to check if it has been done using the Free National ChipChecker

What should I do if the information held in the documents doesn’t match the National ChipChecker?

What other things do I need to notify the Passport Issuing Organisation of?

What do I need to record in the Equine Passport?

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This information is provided by Equine Register for the purposes of basic information sharing and guidance. However, any information provided cannot and must not be relied upon and independent opinion should be sought.