Guess what: I don't believe you.

The restriction was created by The Buckinghamshire County Council (Bletchley Pus Station) (No Entry Except Buses) Order 1985. There is no corresponding order revoking that.

"The effect of the Order, which will come into operation on 29th July 1985, is to prohibit any vehicle other than a bus, coach, contract bus express carnage, school bus
works bus or security vehicle proceeding in Saxon Street from entering Bletchley Bus Station.

Exemptions in the Order relate to building operations removal of obstructions maintenance of the road sewers pipes, telegraph lines, fire bngade, police and ambulance
duties immediate emergency maintenance work on a defective vehicle and in pursuance! of statutory powers."

The correct tagging of the above is:
vehicle=no + bus=yes + motor_vehicle=private + emergency=yes
(emergency=yes is often omitted, since it is taken for granted that emergency services can go wherever they need).

https://www.thegazette.co.uk/London/issue/50210/page/10337