No, we live in Ealing so when we mention this to the queue marshal, they take the driver's number so they can skip going back to the main holding pen and join the nearer filter.

Their existence has certainly made a difference as before then my interactions with black cabbies from LHR was frequently unpleasant. Trying to swap onto other drivers at the roundabout, complaining loudly on the phone about what a c*** I was for being such a short fare "oops was the intercom on, sorry". etc etc