Smeg F67-5 oven not heating up. Hi,I posted a question yesterday about a smeg oven not working and

Question

Hi,I posted a question yesterday about a smeg oven not working and the response that came back was either:Thermostat orElement1. Is there any way that i could check which part was faulty 2. If i had to replace the thermostat element - is there somewhere that i could look up on how to do this3. Do you know where the best place to buy the parts isThanks for your help