wrote in message
...
I'm guessing there isn't one. Or they're exempt. Otherwise how can a black
cab stop halfway across a signalled junction in the middle of the road, on
a
corner, on double red lines in central london, blocking the traffic behind
to
pick up a passenger and some plods in a van nearby do absolutely bugger
all?

There are exemptions in the Highway Code permitting black cabs and minicabs
stopping wherever they bloody like and for using their horns at 10 o'clock
at night in residential areas.