Is it time to start calling out bad cyclists?

That would certainly have been better. We are going to suggest this for the A10 CSH (scheduled for 2015). The best thing would be carriageway markings similar to 'sharrows':

http://en.wikipedia.org/wiki/Shared_lane_marking

We have cycle symbols in the carriageway in London, too, but they are usually in the wrong position.

I personally find these to be the best compromise, the other problem is merely the fact TfL decided it be a good idea to put all the transport from cars, buses, HGV, bicycle etc. on one tiny road (CS7).