Oliver / David
If drum is turning but not heating, probably the fault is one (or both) thermal links mounted under the heater cover. Remove the back cover plate which should reveal the heater array, held in by 4(?) screws. This can be unplugged, unscrewed and removed. The thermal links are mounted at one side. test with a multimeter. If failed, try to replce by visiting independent electrical appliance retailer / repairer. Otherwise, buy new element at much bigger cost!
DB, February 2008