If you have found the information on a Register or Title Plan to be incorrect, here's what you can do:
If you need to change the information on an official Land Registry document, you will need to apply to the Land Registry directly. Unfortunately, you won't be able to do this through Nimbus®.
You can find the HM Land Registry page that deals with updating Registers, change of ownership and similar topics here: https://www.gov.uk/registering-land-or-property-with-land-registry/update-or-correct-the-register
Here you will have access to lots of useful information, plus links to the necessary forms.