David,
All testing stations have the facility to enter recorded distance in either miles or kilometers… but many do not realise (and I guess some probably can’t be bothered)
My 15/6 is recorded in km but, when I sent my speedo away for servicing, as a temporary measure I fitted a French style instrument cluster graduated in miles per hour and recording trip and total distances in miles. (The fuel gauge also reads “Empty” to “Full” and is graduated in quarters of a tank rather than showing actual litres).
When I explained the reason for the anomalous recorded distance to the tester he just changed the units on the system. Then, when I refitted the original instrument, he changed the units back to km again. Simples ! !
You are very welcome to view the MOT history for my 6, registration number VXS 274, where you will see both km and miles recorded at different times.
B…..