Darren,
This fault is common and usually due to the 'one shot' stat gone. They come as a kit and are located just above the heater element behind the rear cover. Just a matter of removing about a dozen screws. Remember to power off before replacement. We can supply the thermostat kit from here:
http://www.ukapplianceparts.com/laundry.asp?search_fd3=Thermostat%20Kits&search_fd4=hotpoint&multisearch_fd4=5
You need part number 1701583 - the first on the list.
Lee
November 2006