From the collected wisdom of the forum, the manuals and from Seat's own documentation:
Oil change
service every 10K
- change oil and filter
- check brake pads and disks
Full
service every 20K
or 12 months, whichever comes first
Oil
service plus
- change pollen filter
+ check lights, tyres, wipers, "fan belt", toothed belt, steering, driveshaft gaiters
+ levels in gearbox, coolant, hydraulic fluid, power steering, 4wd, screenwasher
Vehicle exterior
- Door retaining straps: grease and lubricate locking pins
- Sun roof: clean and lubricate guides
Not in
service schedule but worth doing - lubricate bonnet lock.
So at 12 months you should do a full
service, regardless of mileage.
The other main time-based
servicing tasks are hydraulic fluid at two years and cambelt at four.