The UK Motorcycle Industry Association (MCIA) and Bicycle Association (BA) have recently posted another bit of PR about this year's problem. One of a long line of things like minimotos, pitbikes, segways, electric skateboards and microscooters, hoverboards. These things don't fit into the UK legal framework so are not road legal. But they're powered vehicles so they're not off road legal in public places either.

It's a rant about the scourge of illegally powerful electric bicycles, especially German legal S-Pedelecs being sold as "Off Road only". And people buying them and then riding them on the road without full Moped or Lightweight motorcycle legality of MOT, Testing, Insurance, licenses, reg plates and so on.

http://www.mcia.co.uk/About/News/Article/Electric-bicycles-and-mopeds-there-are-no-grey-areas.aspx
http://www.mcia.co.uk/Press-and-Statistics/Press-Releases/Article/Electric-bicycles-and-mopeds-there-are-no-grey-areas.aspx

Stealthbikes don't get specifically mentioned although they did display at the recent Excel Bicycle Show.

I've got some lengthy replies and have engaged with them on facebook, but I'm not getting much response beyond marketing flack.