Changes to vehicle specification.
Due to modifications to the vehicle you may be to have your HRVIF updated.
The amended form will need to be sent back to the MSA with a short note detailing the changes. Depending on the modifications you may need to take another picture etc.
Send that to the MSA marked for the attention of Michael Duncan with your HRVIF.
It may be as well to photo copy the front page as proof of issue if asked on an event! He will update your form and the copy at the MSA.
The fee for issue of an amendment sheet is £27.