Thanks for the reply Lincoln Appliance. I was slightly surprised but that's how the old safety thermostat was wired! All I did was remove the connectors from the old unit and connect them to the new one. I have an engineering background and always make notes, draw diagrams or even take photos before dismantling anything.
Anyway it's a bit academic now as I've decided to scrap the appliance and get a new one....definately not a Smeg product this time!
Thanks again for taking time to reply.
Rgds
Don
April 2010