They would have to create a regulation (ie a legal document in itself) stating that their particular form is required - but that would probably contradict the Arms Act which says (as mentioned above) that it just has to be a written order etc. Acts are more powerful than regulations, as the regulation would be created under the authority of the act.
However if they were refusing to sign a written order which didn't use their form, I think you would have to really want to make an issue of it to be worth the cost and hassle of a legal challenge.
Bookmarks