Since then I've only traveled in countries that didn't require one. Trying to maintain those other-side-of-the-road skillz... I do recommend buying the extra insurance when renting a car in "other-side" nations. I clipped my rental car's side mirror on a narrow street in UK a few years back.
I got one 4 years ago and 6 years ago for European vacations, so I pretty much already knew what I was going to find if I delved into your link.
Oh, and regarding “other side” nations: The only place I’ve ever driven thus is in Bermuda, and that was just a scooter. And I raced motorcycles as a teenager, so I’m pretty comfortable on 2 wheels. The trick I learned was to continually silently recite the mantra “drive left, look right” while driving, and that worked reasonably well for me. But Bermuda 25+ years ago was pretty low-density/intensity driving.
London, I was very glad to stick to the Tube and cabs.