If more than one thing goes off e.g. grill and fan assisted oven OR the normal oven, sparker and warm plate there are THERMAL CUT OFF FUSES. It seems there is one for each side.
They are located at the back. It requires the centre metal strip to be removed then the large panel. They look like resistors but with no colour bands. You can unscrew them from the holders and replace them. They cost about £2 to £3 pound each. Check the one that comes out and order the same. Looking at the cooker the right hand side has a 152 degree C thermal fuse BUT check it first.
SWITCH OFF COOKER and I WOULD SUGGEST the MAIN SWITCH TO THE WHOLE HOUSE before trying to do anything.
DAVID
September 2013