That's when you can find one, yes. Granted, this pertains to public restrooms. Now, we were in line waiting for our tour bus to depart for Leavesden, when an older gent got out of line to use the restroom in the deli. Wasn't a few minutes later the girl working there was following him out the door raising all sorts of hell with him for doing so. No available public restroom or not, there's little reason for all that. I felt for the guy. And from that point on, I never even bothered to ask to use the non-pay facilities.
*edit* Yup, thread derailed by toilet talk. We'll get back to Potter now, LOL.