A speed pedelec rider was involved in an accident in London a few years back the police a) returned his bike after their tests, commenting how well-constructed it was and b) advised the CPS not to proceed with any action as it was not in the public interest. Part of the difficulty was the uncertain legal status of the bikes - clearly not a motorcycle. The rider was actually a little disappointed, he was looking forward to the law being put to the test. He did appear in court though - to defend the driver on the grounds of the poor design of the junction where the accident occurred.
Contrary to some ridiculously fabricated accounts I've read here and elsewhere, the bike in question wasn't crushed, he didn't lose his licence, he continued to own and ride the bike for a number of years afterwards. The people who buy these bikes are invariably mature, intelligent and surprisingly often the very people who should be enforcing these laws. Yes there are risks, but we inform all buyers of these via our website and face-to-face. Most decide the benefits outweigh these risks for their purposes. There are many who are simply not in the market for those risks and buy a Pro Connect, an Agattu or something else instead.
Also, I wouldn't sell anything I wouldn't ride myself, which is why we stopped selling electric tricycles. They're perfectly legal at 250W, even under the old EAPC laws, but so scary to ride, even without traffic in the mix. Speed pedelecs are constructed to higher stanards than other e-bikes, particularly certain dodgy Chinese imports with poor reliability, inadequate brakes, malfunctioning motor cut-offs, sub-par power, poor lights and missing reflectors, substandard batteries, frames prone to breakage...