Advance stop lines (asl's/ bike boxes) A WARNING!

[nick crisp]

Also, when I did Bikesafe with the Met a month ago, the coppers there made a point of explaining that it was perfectly legal to filter using chevroned bits of road if enclosed by broken white lines & actively encouraged their use by bikers as it's often the safest way to do it.

Yep, won my case (well, 70/30) when knocked off filtering over such chevrons. However, there is of course another risk here - because it's an area not used often, there's often a lot of road debris there so you can easily pick up a puncture.