Only passengers accompaning a vehicle were permitted and those without could not travel
Silver City realised that a vehicle could include bicycles so they had a small number of bike so that anyone without a car could 'hire' these bikes for a very small fee
That became their vehicle and it was wheeled on to the Bristol Freighter and off again at the other end without the passenger even seeing it....but it had been hired by them and was paid for so it was their vehicle and so got around the regulation.
