Take both of the rear wheels off and take the covers off the drums. There should be a little wheel on either side behind there. What you have to do is tighten this wheels until the covers JUST fits back on the drums, and this should sort out your problem. It may need adjusting again from time to time as the auto adjusters are poo!!! Hope this helps mate.
the handbrake should be off .There is also a cable adjuster under the car that takes up slack from the cable see the pic.must be some thing in the air I just replaced my brake shoes yesterday