Brilliant, I stretched the belt but on doing so realised I didn't need to.
1. Remove the top and rear panels including the spindle and wear bush, if the belt's gone you may as well replace this as well, trust me, I replaced the wear bush and re-assembled it then realised the belt needed replacing.........!
2. From the rear hook the belt around the motor shaft, leaving the rest of it outside the casing.
3. With the drum in place evenly put the belt back on the drum as though you're putting a tyre back on a bicycle wheel, you need three hands and three screw drivers.
4. Gently push the belt across the drum as you rotate it.
5. Before tightening all the screws make sure the heater fan isn't catching on the body work....Job done in about 75 minutes (ish)
Broders. (Lancashire), January 2011