By taking a service plan at this time, you will get two A (minor) services which primarily include an oil and filter change and a thorough inspection of various components, in addition to one B (major) service. In addition, there are other items that need attention during the 4-year service for your diesel automobile, including the fuel filter, air filter, pollen/cabin filter, and brake fluid (which has to be replaced every 2 years according to MB's recommendations). Is a gearbox fluid change included in the service plan as stated in the owner's manual?
In my opinion, the first response would be to approach a local independent service provider that has expertise in handling Star systems and is capable of updating the DSR (digital service record). It would be appropriate to enquire about the cost associated with obtaining the necessary updates. Seeking a recommendation for a reputable independent service provider in or around Chester would be much appreciated.