No one should be able to pass you on the inside (i. e. right in US and left in Old Blighty). If you get passed on the inside, you're not driving in the proper lane - that is, the most "inside" lane that's available and not blocked by people going slower. Why aren't you?

I used to fight with my mother about this. She always said it was fine to drive in the fastest lane as long as you were doing the legal limit, since anyone who wanted to get by you was a criminal, and had no right to complain. She got very upset about people tailgating her and passing on the right. I tried to remain polite and respectful in explaining my thinking in the matter. Part of the time, I succeeded.

Peter.