i had another go today and stripped down the front of the dryer this time. i found a couple of wires that didn't seem to be going anywhere, they trailed down to the inner door section. inside there was the front thermostat so i replaced it and whipped everything back together again. i can confirm that it is now producing heat again and working correctly. the front thermostat is part number 1701575 and costs between £6-£9 on ebay. the job should take you about 45 mins and only slightly more tricky than replacing the rear thermostats.
I hope this helps someone.
Paul Douglas
Paul Douglas
January 2007