This is especially the case going into Downing Street, and I would rather go round the other 3 sides of the square and make it a left turn than do that right turn.

Oh yes, *that* turn. Made even more joyous by having a tiny window to cross into a very narrow space and all of the pedestrians just stepping out into your path. Most of whom do not like it if you say "excuse me please" repeatedly at them. It doesn't get much better after that given the typical number of obstacles and people stepping out and cars turning out :-(.