@robryk If you are resisting a legal arrest then they can charge youw ith resisting **on top of** the reason they were originally arresting you. But the reason for the original arrest can not be resistance of arrest itself as you cant resist an arrest before being arrested and you need a reason to arrest therefore it cant be the reason.
Its well established case law, but no, off hand I dont know the specific case that would address this. I also dont really have the time and bandwidth to search for it for you.