Are the MU compiling a list of members who are talking to specific authorities, so that duplication or omission can be identified?

Also, not being a professional musician, I am not a member of the MU.
Would I be able to join, and would increased membership lend weight to their campaign? Is there an associate member status?

I did write letters to my MP before the act was passed, but they were just passed over to the originator who gave me the standard reply about a good thing it was. So much for representation.