Built in Indesit oven in need of repair (Yarpole HR6)

This single oven (standard size) was working perfectly until a couple of weeks ago and then it began to overheat. The thermostat is on the control board so I bought a new one (£80) and fitted it but I couldn't get the oven to come on properly. I don't have time to look at it any further so I bought a new one. However if anyone has the time and know how, the pieces should all be there to get it going again.