I'm in Derry too and I've parked my ebike up as well, I was enjoying commuting to work on it, especially up the Crescent Link in a headwind whilst everyone else is stuck in the queue of traffic!
We had a scheme at work where you could borrow an ebike for a week to see how you managed, this was all stopped too and the bikes are now gathering dust somewhere.
As much as I enjoyed it, I wouldn't consider registering and insuring my bike , particularly now that I read that I can't take an ebike on a designated cycle path or pavement. Most of the route from my house to work is a cycle path, I tried cycling on the road on my road bike and having to weave in and out of the side of the road to avoid potholes and road furniture whilst school runs are on and white van man passing with just centimetres to spare put me off that idea.
I came across this video on YouTube recently of an American visitor who was stopped by police up near the Titanic Quarter, you can see how depending on which police officer stops you, you may get two very different outcomes.
https://www.youtube.com/watch?time_continue=595&v=yUt4aBe9q-0
In Belfast I've seen an elderly man many times on his Freego Eagle and a young lady on a Freego Wren near the city centre. I've also seen a Chinese gent making light work of a steep hill on a small-wheeled ebike. These people are not a threat to public safety. They were moving at a more sedate pace than a fit young man out for a cycle on an ordinary bike.
Watch from 10 mins into video