wow you have a CRB once a year i am impressed with that, is that standard for all taxi companies do you know?
Over the water in N.I all taxi drivers are CBR checked when they apply for their taxi licence (every 5 years), then again every time they PSV (Public Service Vehicle) their car, (like an MoT for taxis).
My company does work for the education boards so every year all the drivers have an enhanced disclosure check also.
But I suppose it would be possible for a taxi driver to only be checked every 5 years when they renew thier licence if they drive a pool car.