So I have a 2005 cyprus import wrx, the service book doesn't actually list service information, however I do have all of the tick sheets from previous maintenance.
The car is on 90k at the moment, the service intervals go

10k 20k 30k 40k 50k 60k
12m24m36m48m60m72m

The sheet indicates that the timing belt is due @50k, which has already been done.

The 70k (10k service) and the 80k (20k service) has already been done. Next up is 90k (30k service) which consists of all oils, coolant, plugs etc etc.

After that at 100k it should be a timing belt as another 50k has passed, however it actually lands on the 40k service and not the 50 one

What's going on here exactly?

 

Hi, Mines (2005 Wrx )from Cyprus also
But mine was brought over straight away
. Anyway you should have service interval info in your main reference manual with car. Intervals for timing belt are every 50k miles (or kph) as you said or every 5years. So do it earlier than later if not sure. Even Subaru will be flexible on this regarding if its done on a 90k service.
I have also brought some servicing work in earlier like plugs and brake fluid just be be sure
Try this link for servicing

http://www.scoobyworks.co.uk/servici...ces_newage.htm

cheers Phil