I'm very aware that this might be dodgy territory and some people are likely to have a knee jerk Paisley NO!!! moment, but still.
There's an awful lot of eBikes around this area, there's little doubt that many are illegal (as are 100% of the scooters), there seems an uncertain division between eBikes, moped and motorcycles, and there seems little doubt that the risk factors around these ratchet up immensely.
So, how about registration/number plates for eBikes? Based around and linked with an RFID or similar embedded in the motor?