I bought a second hand Hornby R965 DC controller from my local model shop, just for checking  that new locos run OK before converting them to DCC. I've had 3 faulty ones, which I have taken back each time and the shop has exchanged with absolutely no problem, in fact he could not be more helpful. 2 of them have had the same fault, ie. when the speed control knob is turned off the loco on the track is still creeping ever so slowly along. The fact that 2 out of the 3 have done this makes me won