Rangemaster 110 all electric range cooker problem?

The left side (as you look at the front) rings are not working and the light on the fan assisted oven doesn't fully go out. If I try to start either of the left hand rings or the grille, the clock goes out, so then the ovens don't work. I replaced the outer element of the non-fan oven but it has gone through all the workload of Christmas with no problem. I suspect the problem is the left front ring (leftmost switch) as it the problem arose when it was switched on. How can I tell?