You've all been very helpful so far, thanks.
Re. Cabling: I'm competent with a soldering iron etc., so while I don't mind too much about cutting and splicing cables for PAS etc., I'd prefer to leave the 9 way Julet motor connector as is, so looking for a mating cable. I seem to be able to find plenty, but they're only 600mm long, which won't reach from the controller, which is between the seat down tube and the rear mudguard, to the front hub. Any idea where I might find a longer cable, without breaking the bank?
Also, I'm hoping that the LCD5 display I ordered comes complete with cable, but it's hard to tell from that Pswpower web site.