I know that everyone tends to look at the mileage however I think there is a recommendation in the booklet for VW Bora that they are changed every xx miles or 4 years !
The wifes Bora was changed in July, hence the reason the time periods brought back memories as its only done 43k miles.
In view of the age of the car would be worth getting it done, tensioners, water pump etc as well and that will be a damn sight cheaper than if it went !!