(Later) Elisabeth, who is a JP in the South-East, has emailed this germane comment:
I wrote to The Magistrate to complain about this motoring example as it appeared either just before or just after a table of the normal speeding offences for which a fixed penalty is offered.
This excess speed fell within the FP tariff and should probably have been dealt with as such, unless there were exceptional cirumstances.
No wonder people say we don't know our arses from our elbows!
Thank you for that.