It's a bit confusing
Construction and use says it is a Legal requirement to have a speedo fitted Except in the instances below
I know they don't test them (perhaps so that someone can't say It showed 30 mph Officer adn its just been tested at MOT)
Apparently it is an offence to drive or ride without a fully functioning one Undamaged and unobscured from rider / drivers view
Yup. Back in the day, I got booked on my Tiger Cub for just that offence. The cop tapped the speedo. It was stuck at 40mph! 30 bob fine!