There is a lot of talk about new laws on restricting bikes,and manufacturers seem to be trying to play safe,this happened years ago with 50cc mopeds and scooters restricted to 30mph,although sold restricted most can now be derestricted at first service to allow 40mph,considering these are proper motor vehicles needing insurance mot etc,i have never heard of anyone being charged with riding a derestricted motorbike (probably at least 75 percent are),which would also invalidate insurance.with an an assisted electric bike it would be almost impossible, to prove that the bike was travelling faster than allowed,due to the bike may be on a slight downhill or being pedalled.bikes will sell a lot better if they have an easilly removeable restrictor,and manufacturers will still be selling legal bikes.