Possibly find a local mechanic that specializes in BMW. Call and ask if they work on Minis as well.
Please do not give up on lecturing. We live in a lazy society and I am sure there are people out there who do not care enough to take care of their vehicles. However, I say most of us simply don’t know better. My dad was raised by a single mom so he never learned how to take care of a vehicle, therefore I never learned. If people who do know don’t lecture, there will be more people like me.