It was actually about different driver experiences in Britain, but part of it dealt with a cabbie-in-training. They filmed part of the verbal exam and it was brutal.
I've taken cabs in London and I think they're the best in the world. (At least that small part of the world in which I've ridden in a taxi-cab, i.e. Chicago, Denver, New York, San Francisco, Seattle, DC, Arlington, Philadelphia, Munich, etc.)