I know, and i paid the fine, but there are times when you honesty have no choice but to enter the junction. Driving in London is quite cut throat sometimes.
I could have sat at that junction for hours waiting for a space to arrive, the whole area was grid locked and the traffic to my left was under the control of a separate set of traffic lights and they just kept filing the space so that when my lights went green i had no where to go. This went on for a few phases until i had to enter the box junction. I didnt impede anyones exit as it was blocked beyond the box.