Vauxhall Zafria 2.0 diesel DTi 03 plate?

Can anyone tell me whether my car has a timing belt or a timing chain? A friend is fixing a problem on the car and he suggested we replace the timing belt at the same time as we're on 90,000 miles. However, when I tried to purchase a timing belt kit the guy said to check to see if the car has a chain rather than a belt. Can anyone help?