If it helps, Neima still has her original Kmh face for the speedo... and past all MOTs I have put her thru.
These have not all been at same MOT station either.
The choice to fit a chip so it reads Mph or change the face is a personal one and not a LEGAL requirement.
If it was it would have been done when the vehicle entered the UK and had it's first VOSA MOT before being allowed on the UK roads.
I have got used to the Kph and the conversion mentioned earlier is easy to remember once you get used to it.
Welcome to A.P.E.S. and I hope you enjoy your time visiting us..