When we moved to the UK in the 80's, we only had to take a written test, no driving test like in the US.
Was a visiting military license.
Wife was by far a better driver than I was over there.
We had a manual shift car and I never got used to shifting with my left arm...
We drove for 4 years and just felt our way dealing with roundabouts and driving on the Left.
(the military jeeps, trucks and Hummers had the steering wheel on the left, which wasn't easy to drive
on UK roads)
Generally, I liked the roundabouts till I got to some of the larger cities where you really had to think
about where you wanted to exit.