Oil and Filter 
Just that - recommended for high mileage drivers, every 6 months or 6,000 miles 

Interim Service 
Oil and filter change 
Battery test
Brake and brake fluid check 
Coolant check
Washer fluid top up
Exhaust system check 
Wheels and tyres check 
Suspension check 

Full Service 
Everything as with Interim Service
Air Filter change 
Spark plugs (if applicable)
Fuel filter (if applicable)
Full diagnostic check