On my Astra I've done full service:
Air Filter
Oil Filter
Oil
Plugs
Fuel Filter
Front Discs and Pads
Not really needed to do anything else tbh
But...on my last car I did everything
Fitted Rev Counter
Changed suspension
Lowered torsion bar
Even changed the exhaust myself after having it fitted for the first time, I used to put the cat back on for the MOT
I like saving money, as Vauxhall wanted £190 for the BASIC service, and I did everything inclusing brakes for £90 delivered