Hello everyone :-)

I currently have a 2012 Leon FR 1.4 tsi and its on a long life service plan. It is due a major service shortly and I am not sure to take it to a Seat dealer or somewhere else cheaper. Am i right in thinking it needs a major service every 2 years/20000 miles when its on long life plan? I have had the car 18 months and it was on long life when i bought it. I average about 12000 miles a year. I was tempted to get national to just do a oil change for £42 as the dealer major service is £279 :-( Thanks