Britannia SI-10T6-GRA-BR, had a replacement element in the small oven about 15 months ago, it’s now taking ages to heat up and only gets to about 170c. Been using the large oven more until last week, kept smelling an electrical type burning smell although the oven appeared to reach 200c without problem until now nothing works on the left hand side, including clock, lights etc, right side is still working so power getting into the oven. Anybody any advice please, thanks