Starting with Wales, Scotland next? Then Cornwall ... one County at a time ... what could possibly go wrong?I would suggest we change over gradually
If they can do it overnight:
"On Sunday, April 2, 1972, Nigeria ditched the British-styled right-hand drive to the left-hand drive common among the French, German, and Americans."
Most of them were driving down the middle anyway. Especially trucks. With one working headlight.
I left Nigeria in 1971 so I missed this changeover.