Re: yard/mile on our roads for some strange reason
Having lived through such a change (Imperial to metric) in two countries in 1973 and 1974, the roadsign and car odometer change isn't that difficult to deal with, people just deal with it.
For starters, all UK roadsigns are already positioned so they can be changed to 400m, 800m, 1/2km, 1km or 2km and have been for a very long time, despite being written in miles (1/4 mile and 400m are interchangable)
Fahrenheit to Celcuis is far more annoying. Using a scale which choose frozen brine as zero and Ox blood as one hundred didn't make a heck of a lot of sense at the time and it really still doesn't. At least Celcuis stuck with the same substance at both ends of the scale.