Motorcycles in your bus lane

First post - what I've seen recently is an increase in the number of aggressive, over reving, big motorcycles driving right close behind and expecting to bully their way through. It gets my goat.

Its not big bikes you have to worry about, they have so much power and acceleration that they'll be round you and gone before you know it. The unsafe ones are the little learner bikes and mopeds, their top speed in traffic isn't much more than a fit, experienced cyclist, they are much more affected by wind and the wind from passing vehicles, and because they accelerate slower they will be trying to overtake in the same spots as cyclists, or trying to make time up by recklessly filtering or cutting up the outside of queues.