How can i fix My Drier?

My Clothes Drier, a Hotpoint TDL 30S Has stopped working, I am suspect of the door catch as am i correct in thinking that once closed the spigot on the door makes contact with an electric switch inside the machine and starts it spinning. Or My second suspicion is the Minute Timer Switch to start the required timing of drying the clothes is worn out and faulty, how long is a switch that has to rotate, expected to last, before parts start to wear out, I have checked that the fuse is ok, so im really stuck with a pile of wet washing