Emergency! Clock running but oven not heating?

Dinner party looming hence the urgency! I have an Ariston built-in double oven, not sure of the model, but it's got a large oven above a smaller one which also has a grill. The clock is running but neither oven is heating up at all. If I switch off the switch on the 'cooker' wall-plate the clock stops, so I'm pretty sure there isn't a power feed problem to the oven itself. Is there an internal fuse that may have blown? I find it difficult to believe that all the top and bottom oven and grill elements have all failed at the same time.