It's not really beside the point though. You can still legally pass a car in any other lane, if there are two or more and they are free. In the UK if an idiot like this hogs the fast lane, you are not allowed to pass them until they move over for you, even when every other lane is free of traffic. Try that for a few miles and see how different it feels.
You can't pass a car on the inside lane if the inside lane is occupied. That's not how physics works.
I've driven extensively in both countries. It's worse in the US.