Misty eyed bollocks imho. The majority are frustrated white english men with a chip on their shoulder, believing London owes them a favour.....It's absolutely ****ing everything. Ask them anything and they'll have an opinion on it.
I used to take a hell of a lot of black cabs and yes the drivers have done the knowledge. But as sad as it is, that's irrelevant now with satnav, you have to move with the times. Time now for black cabs to adapt their business model to become competitive again.