OK time to let the cat out of the bag.
Here's our law on electrically assisted pedal cycles
https://www.gov.uk/electric-bike-rules
Simple. Not really heard of anyone up in arms about it.
If you don't define them as motorised vehicles in the first place you don't box yourself in.
To clarify for those who don't know: the UK and EU have different manufacturing requirements around the amount of power ebikes can have. The ebikes reference here have lower power thresholds than even Class 1 ebikes in the US like the type reviewed here.
(And @Philpug -- totally support breaking off this ebike debate into its own thread rather than polluting your review.)