Rob
I was having that conversation a couple years back and, from memory (i will email my mate OS to be sure) but the cars in the US have the belts done at 60000miles.
BT
I was only basing that on the doco I had for V8 Lexus a few years ago. The service interval showed 100,000 miles for the belt. Here it was 100,000 for the same belt. Maybe they have updated since then, or other manufacturers factor in the miles/km difference.