I now have an 8F and an N2, and both are superb. The 8F is particularly good - if this is the standard the new Hornby loco-drive A1/A3 will be built to, I will be very happy to pay for one.
Thanks for your recommendations. And they both run very smoothly indeed.
Anyone know of a reasonably straightforward motor / running gear replacement for the execrable Hornby J83?
Guy === May contain traces of irony. Contents liable to settle after posting.