Legality of the Archway/Shepherds Hill box Junction?

[a1001]

I got a ticket through the post for stopping in the box junction. When I made the decision to drive into the box:

1. The cars in front of me were all moving, nothing was stationary

2. When I look at the picture, about a 1 - 1.5 ft of my car is in the box

3. Although this is initially a 2 lane road, the 3 cars in front of me were straddling in the middle of the two lanes, I was trying to stay to the right lane as I did not want to get blocked by parked vehicles ahead if I stayed in the left lane. If I would have forced my way totally into the right lane, half of my car would have been on the opposite side of the road.

4. The lights were still green at the time I had to stop in the box

5. I was not obstructing any vehicles if the lights had changed to red

6. I have driven down this road plenty of times over the years and have never stopped in the box

 

I was just wondering if anyone had any up to date info on whether the box junction is legal? Everywhere I've looked seems to date from 2006-2010, any info or advice would be appreciated, I could really do without having to shell out £65 two weeks before Christmas.

 

TIA