Thanks for all your replies, I will try and get down to MTB monster and blag a demo.
In answer to the question of why a lightweight bike not a bigger Ebike, i’ve had a “Full fat” enduro spec 160/160 ebike, and once the battery dies it is a misserable experience trying to get the thing back to the van (It very nearly got thrown in a bush at Gisburn, when it decided to die at the top of Hully Gully and I had to manhandle it all the way back to the car park)
I know a guy who has a Gen-1 rise and he says he can happily ride it with the motor turned off. And I think that is what I am looking for, something I can peddal about with no or minimal assistance, then turn it up for the steep bits (Unfortunately he rides a small and I am very much in the XL size bracket, so I cant try his)