Rules of the road please help

[mickvp]

I would have said it would be more the green cars fault than anything. Yes, the blue car flashed them out, but this means nothing as the onus is still on the green car to check its clear before actually going out. The red car is past the line on the wrong side, but is really just filtering and giving themselves a bit more room?

Worst case split fault between bike and car, but i personally see the green car is at fault. flashing people out is a problem in itself, but the highway code is pretty clear on what flashing lights means legally (although that is rarely what its used for).