After loads of searching and quite a few test rides on different makes of e-bike, I finally narrowed my choice down to three of the Haibikes.
With some comprehensive advice from Martin, and the apparent professionalism of the e-bike site, I went and bought the RX 27.5. This bike is not only lovely to ride but lovely to look at, especially useful when the weather up here is so foul you hardly dare venture out!
Pluses are the powerful motor which gets me up all the Pennine hills with ease, the dropper seat which you don't know how useful it is until you have one, the single sprocket up front and the 10 speed cassette at the back, the reasonable weight and the superb build quality.
There are no cons, I love the bike and can't wait for the winter to go.