Main thing is to check when the cam belt was last changed bearing in mind it needs doing at 40k/4yrs and that both the belt and tensioner pulleys must be changed. If there's any doubt get this done ASAP.
Other common issues are to clean out the crankcase breathers, keep an eye out for coolant leaks and check the coolant is not contaminated with oil. Do any routine servicing that needs doing (we would recommend changing the oil more regularly than the dealer service intervals. every 3-4k is ideal). Coolant needs changing regularly as it can corrode the oil cooler if it is allowed to get old. It's worth changing the automatic transmission fluid and filter if there's no recent history of this having been done (it's not a service task according to VX but worth doing if the car has covered a fair mileage).
Have a read through the FAQ and maintenance guides as they cover all the common issues.
Kevin