My wife suffers from knee problems, so we're in the process of buying a pedal assist+throttle ebike to enable her to get around the city of Bath. A moped would not enable her to take advantage of the cycle paths in the area. She would still need to mix with HGVs on the road.
It naturally needed a basket and the right colour :) http://www.juicybike.co.uk/electric-bikes/classic-click-dutc...
Electric bikes have benefited massively from technology advancements in the last couple of years and anyone looking at an electric scooter should seriously consider an electric bicycle. It offers a lot more flexibility in where you can go with it.