Yes. Great help.
I went outside and tried to jiggle the metal plate (couldn't get too much movement, do you have to be quite stern with it?). The noise was there a little when i reversed but soon went away. I dont think i really did anything but the noise has gone.
Is there any point in keeping the appointment with VW so that they can maybe take wheel off and have a good look? The posts would seem to say that this is just something which happens but goes away and not alot to worry about.