Hand a car over for brakes and you can see the new discs when you get it back. Hand it over for a service and you get back something that looks exactly the same as when you dropped it off. That is why so much servicing gets sold in three vague words, and why plenty of people quietly suspect they have paid £200 for an oil change and a look round.
Worth knowing: a service is not a legal test like an MOT. There is no official definition of a "full service" anywhere, which means one garage's full service can be another garage's basic. Compare the lists, not the labels.
So the whole list for every tier is published below, before you book. And when the car comes back you get an itemised note of what was done, what was checked, what was fine, and photos of anything worth keeping an eye on.
If something on your car does not need doing yet, we will tell you it does not need doing yet. That is not generosity. It is how you end up with customers who come back.