John Rowland wrote:

Taxis with passengers on board, however, are not at all considerate of other
drivers IME, but I suppose this is because they *are* being considerate to
their passengers, who end up with a slower, and dearer, journey for every
act of consideration that the driver shows to other road users.

Yes but you should probably still merge in turn when it is appropriate
to do so.

Stopping to let traffic out of side roads can also be inconsiderate -
to the drivers behind you. You may not be in a hurry (and I doubt a
taxi "for hire" is in a hurry to go anywhere) but that doesn't mean
that they are not.