One thing i would look at , is , if your warranty ends around the service mark time , then i would look at the mileage and then make that decision myself if it needed to be a Major service or not , if your only doing say 6000 miles a year and you then are out of warranty , then your could do another intrim service before a Major if your milage is well below the expected mileage and as long as far as mileage your keeping to Major componets thats what i would follow.
I would keep to them IF that requirement meant i was keeping up with my warranty.
For instance my car hit 12.500 miles before the the first year so it was serviced at that time.
I purchased the car and at the 12 month period of the first service i had it serviced , so in November i will need a Major service , but i will still have 4 Months left on the warranty so i will have to have that done
Car has only covered a little over 15,000 miles in 3 years so I hear what you are saying but if the dealer says it's a Major (and we go for a Minor) and a warranty item is flagged up would the dealer cover it given we have potentially not followed the manufacturers recommendations? It's strange the service manual says the service frequency is minor / major etc but the dealer says it`'s minor / minor / major?