Re: Britannia SI-10T6 oven overheating
I did some more investigating, especially as the temperature light stayed on, and found that the return wire to the light was connected to earth. This should have been the switched line that the thermostat switches on and off but was permanently, effectively, on. Tracing the wire I disconnected the various elements etc to try and find why this wire was connected to earth. It turned out that the bottom main oven element has blown and was shorting to earth a few inches from the return terminal.
Disconnecting this wire from the bottom oven element and now the thermostat switch is working as expected and the light follows the demand for heat.
New element on order, wire disconnected and insulated so most functions of the oven are working in the meantime.