Hi James, my idea of a service is oil and filter, air filter, pollen filter, fuel filter, plugs, if this is done once a year you won't go far wrong for the following reasons, plugs tend to degrade over short milage, air and fuel filters suffer the same, if you don't use anything other than premium fuel they may last longer but we have all of a sudden come from 6k or yearly service to 18k or every three years, this is all to make the car appear super cheap to run, then we have service plans which don't cover fuel filters and air filters, they might change the oil filter with the oil if you are lucky, main dealers are thieving scum, find a good independent and tell them what you want done, there are loads of posts on this forum from people who have dealership service history who have decided to have a go at changing their own air filter [simple] and found more dead leaves in the housing than are in your local park, over the years I have had more than enough arguments with main dealers over shoddy servicing, thats why I do my own at least I know its right.
Steve.