One of the main things in the UK as opposed to the US is We don't have Left on Red (Your equivalant to Right on Red). Controls are very much the same in the car as in the US but you will probably have a gear shift instead of automatic . We don't have yellow school buses so you won't have trouble with the School Bus laws which I had to learn in the US. Roundabouts are the hardest thing to get used to but I think after about half an hour you should be driving like a native.
Bill