What a UK metric road signs changeover could look like

We have explained the need to go metric, to have metric road signs, and have given many examples of what metric road signs would look like. I also believe metrication is a good time to have a look at signage improvements including clutter removal.  I do not plan on going into too much detail about the changeover, as metrication and road signs have been rather overdone (on this blog). But I do intend on looking at the key points.