'Cause it's the cyclists that need educating...

Also found this;

It's mostly pointless to overtake a cyclist in London, because according to TfL, the average speed of a car in central London is 9mph, whilst that of a bike is 12mph. Of course there are plenty of occasions where overtaking a cyclist is safe and appropriate, but those occasions are not the ones cyclists tend to notice!

from here;

http://www.londonskaters.com/cycling/safety-heavy-goods-vehicles.htm