Disconnect the power before attempting any work. Use of an RCD (plug in power breaker) is recommended.
Most likely a blown heater element in the drier unit. Also check the fan in the drier unit - if its not rotating, the element will have overheated and possibly triggered a thermal cutout device which cuts off the power to the heater element. Some thermal cutouts can be reset, most need replacing. Only way to test is to disconnect the wiring and take resistance readings across the element and any thermal cutout device with a multimeter.
Repair and service your own washing machine. Go to www.2ndwave.co.uk/manual.html
dannyboy, October 2008