@cliffordbeshers Fortunately they have cars that are also backwards. The rule I learned in my one UK visit was to keep the center line on the driver's side, just like in the US but with different cars. I love roundabouts -- drove from London through Dorsetshire without hitting a stop light -- but yes, they were scary.
@Miraz Yeah, I saw some and I think I remember reading that there was a plan to add them everywhere. I developed my own method, which was to look out my window and down to find the centerline. If it wasn't there, and I saw the shoulder, I knew I was wrong.
@cliffordbeshers@aaronpk Before Covid NZ had heaps of tourists from overseas many of whome drove around sightseeing. On roads outside cities, where tourists are likely to be, there are sometimes painted arrows on the road to help point out which side to drive on.
Also, for driving, I'll share an experience. In cities and towns, I found it easy to drive on the left, because all the signs and traffic keep you honest. It was when I got out to a lonely highway with a simple stripe down the middle that I had trouble. There was nothing to distinguish it from a U.S. back country road, except those idiots a few miles ahead coming at me in my lane...oh, wait...