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Replacement Test Documentation
If an error on a VT20 is identified, the VTS/NT who issued the
original must issue a replacement free of charge after the
relevant details have been verified.
A replacement can only be issued at the issuing VTS for a change
in vehicle colour or a change to the current odometer reading.
Changes to an odometer reading can only be completed within
28 calendar days of the test completion, the new reading must
be that seen on the day the replacement is issued.
More information can be found here:
https://www.gov.uk/getting-an-mot/correcting-mot-certificate-mistakes