At the moment my WRX has only done 40K and when I bought the car 4 years ago it had a full service and cambelt and plugs etc changed.

Since then I have probably had 3 minor services but no major; what is included in a major... Last minor service was done in March 05'. I have since having the car only done roughly 20k miles... (ave. 5k per year)

When should I have a major service and any indication on price?

Thanks in advance for advice...