Which Volkswagen 1.2 three-cylinder diesels have timing belts and which have chains?

Does the latest Volkswagen 1.2 three-cylinder diesel use a timing belt or chain? I am considering a new or nearly new car, but try to avoid timing belts.

Does my Vauxhall Vectra estate have a timing belt or timing chain?

I have a Vauxhall Vectra estate, 1.9CDTi. Do you know if this car has a timing belt or a timing chain?

Should I have the timing chain replaced on my 13-year-old Ford Mondeo?

I have a 13-year-old Mondeo that is running well but I am wondering about the timing chain. If this goes the car is scrap. Should I have it changed and is there anything that should be changed at the same...