I have a 'Simpson 2001 Thermaflow Oven' and a few months ago, i was heating it up, and i heard a pop, from then on my oven has not heated up, i cannot seem to find what is wrong with it!! Please help!! regards.

I would say that the oven element has blown. It is common especially if you have a fan forced model. Make sure the fan works before you go buying a new element as the replacement will fail early. Simpson ovens have to be removed from the wall cavity to replace the fan and the element. Make sure you tuen the power off before doing anything...
Give the parts supplier your model number so that you get the fight element ( and fan) if necessary.