OK so there is a general agreement (I thought) that Fiats cambelt replacement intervals were "optimistic"....

See the Thread linked below... any Techy types available to add their 10 pence worth so we can work out what to do and when?

https://www.fiatforum.com/multipla/216104-more-damage.html

This does vary so much between cars. My Focus is every £100k miles or 5 years.

The Alfa Twin Spark I used to have according to the manual was every 72k or 5 years. This was changed to 36k and 3 years due to so many belts going twang.