John - if your local workshop has not done a belt change on a Sigma before, you might want to diplomatically check that they know what they are up against.
It's not quite as straightforward as it might first look because the cam pulleys have an internal advance/retard timing mech and I believe a special tool (or some ingenuity) is required to hold these in the correct setting - in addition to the normal tdc stuff for the external cam pulley teeth.
If required, there must be a Ford dealer nearby who can also advise? (and they may know this engine as Zetec-S, Zetec-SE or - even more confusingly in some markets - as Duratec Ti-VCT)
