generally the reason for no heat with this range is the overheat thermostat has operated. Two thermostats(one of which is the overheat stat) are situated above the heater which can be accessed by removal of the rear panel. Remove power source ie take the plug out - Test with a continuity meter - both stats should be 'closed circuit' ie showing a continuous path.
The stat kit if required can be bought at www.hotpointspares2u.co.uk simply enter your model number in the search tool.
steve@silverhill, September 2008