Eventually tracked down an adapter and the hub is now sitting in the dropouts with the torque arms. It took a fair bit of adjustment to make it fit. The 180mm rotor is very slightly rubbing the calipers. I think I need another washer but I don't have a spare washer wide enough to fit the axle nor a steel drill bit wide enough to make my own. I'll sort that tomorrow.
I've started to look at the wiring and I think I've sorted it out. But to be sure...
This is the wire connecting the motor to the controller. I guess matching the arrows in each part should do the trick. (very basic I know but I don't want to mess it up). It seems an unnecessarily long wire! I'll have to find somewhere to tuck it away.
The LCD connection (poor image)
At the other end I assume the green connector is for the lcd, the reds for the brake levers (which I won't be using yet). Not sure what the orange connector is for.
That just leaves the yellow PAS connection. I have a left sided PAS which has a different connection. I presume they'll have the same colour wires inside the sleeve and I can just cut and solder them?
Finally this wire seems to be surplus??
I'd be grateful for confirmation that I'm on the right road

I'd forgotten how fiddly all this is!
Thanks
John