Vectra Sri CDti 150 - timing belt or chain?

[speedmachine]

Can anyone tell me if a 2006 Vectra Sri CDti 150 has a timing chain or belt? Google seems to suggest it has a belt my I haven't found anything definitive

Thanks

[speedmachine]

Thanks, just seen one with 84,000 miles for sale at a garage. Thinking of getting it to use for my commute (decided against the LCR!)
What's the interval for the timing belt change? should it already have been done at 84,000?

[speedmachine]

Thanks for the advice all. I am wary of used modern diesels, but a lot of taxi drivers around here that do a lot motorway miles use the CDti so I figured it can't be all that bad, can it? I'll keep all the points in mind. The one I'm viewing has 84,000 miles on it, is 2006 model and up for £3995. I definately don't intend to pay that much though not fussed if I can't get a good deal as there are plenty of vectras to choose from.

Can't really think of other mile munchers for under £4k that are relatively new.