That it's inconclusive and contains flawed evidence. And based on my experience of riding my motorcycle around London - that I can get around quicker, with no noticable increase in risk, and with the added bonus of getting up a bit of speed by drafting Scoble on his shopper.
Thanks for adding your expert evidence. Originally the motorcycle lobby claimed that letting motorcycles into bus lanes would lead to a 40% reduction in casualties.
We (LCC) doubted that based on the evidence already available in 2008. So Transport for London asked the best researchers to design a trial that would give statistically reliable results when they allowed more motorbikes in bus lanes. When the results came in they found that the motorcycle casualty rate had more than doubled, cyclist casualties were worse than elsewhere.
Rather than admit they made a mistake, Transport for London have continued the experiment. To counter the increased risk of casualty to motorcyclists they are spending around £500,000 per year to tell car drivers to watch out for motorcyclists speeding up on the inside. As yet we do not know whether this money is making any difference, the council in Ealing have decided that it is not worth spending at that level.