Undertaking / filtering on left?

I've had this on many occasions, people intentionally turning towards on coming traffic to block your passage. That said I've also had two people try and undertake me on a junction, It's not just cyclists it would seem. One had the cheek to beep me as well :/.

Tower Bridge is bad for this. I had a chat with a driver that stated "we're all over the place. YOu're on the left and the right."

Which causes even more frustration with those that have the requisite speed and skill that still dwell in ignorance and opt to undertake- normalising (sometimes) bedwetting behaviour.