The DVLA bans number plates deemed sexual, discriminatory or aggressive, so you wont be able to drive around a car labelled MU12 DER, PU15 SSY or PE12 VRT.
Somehow, one dodgy licence plate slipped through the net, though.
A customer was unhappy to order a new van, only to find its registration started with the letters and numbers BJ69.
He had been due to pick up the vehicle from van leasing firm Vanarama, but deemed it too rude.
Chiefs at the firm have now contacted the DVLA to raise the issue that BJ – short for Blow Job – and 69 – a sex position in which couples perform oral sex on each other – was a bit much for some customers.
A spokesman said that the customer in question turned up to pick up their new van, a Nissan NV400, at its Birmingham showroom last week, but turned it down when they saw the numberplate.