Hello Jack,
Theyb are a bit of a pain to get off, if I remember you have to undo the handle as well as the other screws, there should be a couple of screws on the faceplate itself, if you can't get the faceplate off concentrate on taking the top off remember to undo the screws under the accessory tray.
Ken
drivewithken@blueyonder.co.uk, June 2008