Not everybody knows the difference between an MOT and a car service, yet essentially an MOT is not optional, whereas a service is. With an MOT test, a garage is inspecting your car and then deciding whether it’s roadworthy or not. If it fails the test, additional work will need to be done to solve the issues, yet it could pass through easily.
A service can also be seen as an inspection (sort of), yet it is based on the guideline of the manufacturers whereas a MOT is general for all car models.
Every year a service is required, and if you want your car to fly through it’s MOT we recommend servicing the car beforehand, you could find a problem early, meaning you have more time to get it prepared for your MOT and you’re bound to save money in the process.