Same with ovens. Stopped heating? Check the heating coil either at the back, top, or bottom of the oven.
You won't even need to pull the oven out, chances are you can unscrew it right there from within.
£20 replacement coil for 10 minutes of work, or pay for a whole new oven?
(The retailer assured us over the phone that they could not repair it, but had great discounts on new ovens...)