I use the 'advanced stop lines' all the time. I wonder if motorcycles will fall foul of this too. I also suspect that I know the answer...
I don't in the car, but why not on the bike? It's classed as "bicycle" on the tax disc.
That's what I do, don't see a problem.
I can see the reason of keeping cars out of cycle lanes - there wouldn't be a great deal of point in having separate lanes if the cars used them as well.