I would look for a mandatory cycling test, in same way as driving test is mandatory - and L plates too for those that have yet to pass it.
I would also look for mandatory cyclist registration number on bikes to enable easy identification of cyclists who break the Highway code. I think this may make the attitudes more accountable.
Yep - that works SO well with the million or so uninsured vehicles; 700,000 untaxed (although I admit that a lot of those are probably double counted); and people driving while DQ'd:
Here's a test. Phone the police and report a driving transgression - speeding, RLJ, using a mobile phone - and give them the registration plate.
What do you think will happen? I'll tell you now - absolutely nothing. They'll do nothing without evidence and even with it, there'll be enough loopholes and it'll be considered so minor (ie no-one died) that literally nothing will be done. You only have to look at how spectacularly awful driving can be (in fact, people can be killed) and the driver can still be found not guilty.
Remember this one:
Pretty clear cut case of driving without due care & attention (maybe even dangerous driving), injuries caused - no prosecution. "Just an accident". Oopsy.
So please tell me exactly what issues you expect number plates on bikes to solve?
Every single time number plates, insurance, cycle tax etc come up (Ken and Boris both mentioned number plates as possibilities when they were London Mayors) and it's been shot down in flames repeatedly as costing more than it would bring in, solving nothing and generally being completely unworkable.
And you can read the BikeBiz article that I linked to in a previous post. You know, if FACTS aren't too inconvenient for you.