phone up the centre and ask them what to do ?
Shoulda thought about that before you booked it!
Ring up the test centre and ask
It's really not a problem, don't worry.
The only requirement connected with a speedometer is the legal requirement that it displays speed in both miles and kilometres per hour.
I'd link to a DSA press release about the use of dual speedometers but the network is down so I'll post it later.
Borrow someone's GPS that displays speed?
they need to be able to see the speedo.
i cant find the test centre number!!