If however, the bike has the ability to push past the 15.5mph limit but is still limited to 28mph, then this is usually referred to as an electric moped or scooter and will be classed as a L1e-B category vehicle. For this reason, it requires registration with the DVLA in order for it to be used on a public roadway.
Electric Mopeds & Scooters that produce more than 250W up to 30mph
Must be registered with DVLA
Must have a minimum of third party insurance
Riders require a CBT as a minimum
Bikes must have a license plate displayed
Riders must be a minimum of 16 years of age
If riders passed their test before 2001, they will not need to take a CBT test
Riders must wear a crash helmet