Conversion of private motor cars into off-peak cars and their reconversion
23.—(1)  Notwithstanding rule 4(1), where a private motor car is re-registered as an off-peak car under the Road Traffic (Motor Vehicles, Registration and Licensing) Rules (R 5), the same certificate of entitlement which was used to register the private motor car shall be used to register the car as an off-peak car.
(2)  Where an off-peak car which was registered as an off-peak car pursuant to paragraph (1) is re-registered as a private motor car under the Road Traffic (Motor Vehicles, Registration and Licensing) Rules, the same certificate of entitlement which was used to register the off-peak car shall be used to register the car as a private motor car.