No Right Turn
In response to the comment titled "these guys on motorbikes are bellends":
The reason the taxi drivers (and other vehicles) turn left and then do a U-turn is because it's perfectly legal - they are not breaking the law so the council cannot fine them! They can only fine people who don't comply with the 'no right turn' sign, ie. motorists that turn right (which, I'm sure you'll agree, is less dangerous than turning left and then doing a U-turn). The 'no right turn' is not there for safety reasons, it's purely an attempt to stop vehicles using the road as a "short-cut", which just causes more congestion on neighbouring roads.
Westminster City Council make more money from parking charges and fines than any other council in the UK so they are obviously making a profit, even though they pay NSL Services Ltd, the company that holds the parking enforcement contract and operates the CCTV cars, over £100,000.00 per month for each camera car!