Ciclomaster has a Radius of wheel (measured) input.

I just havent bothered with re installing any since my last long tour ,
where I rarely looked at it .

Now people cannot stop looking at their Smart Phone for more than 10 minutes.

by the way there are widgets to add to the vertical part of your M/P bend handlebar
to mount a computer , and/or a Battery light
Brompton themselves sell one with their battery light setup.