Totally disagree on the 15mph limit.
While it's a little scary travelling faster than that stood up (trust me, I'm a thrill seeker) I got talking to a dual motor ebiker tonight and he like me said the same after he had had prior escoots too - being able to keep up to the 30mph general traffic made my buying decision easy because travelling on pavements with them is literally waiting to ram someone talking on a phone coming out of a shop or, driving on the road. Which is the only way.
Being limited to 15mph though is outright dangerous in my, and that guy in Farmfoods with his dual motor ebike opinion, too.
I've had HGV's trying to bully me whilst doing the speed limit and it's not fun.
We've all cycled and found the mechanical driver's on roads who seem to think they have permanent right of way even over a cyclist, and been stood up going 15mph+ Vs the general flow of traffic makes for much less stress on both sides.
Albeit stood up going 30+mph and like I say - you need to have cojones right now with our current road system :/