I do understand not wishing to fall out with those you depend upon to look after your Morgan, I have a similar issue with my other car as it is on an extended warranty thus no one can maintain it other than an Official Porsche Centre (OPC) or the warranty is void.... My faith in them is somewhat limited, but I`m tied into providing glowing reports after each service.... Seems if they don`t get you one way, they may get you another...!
If the cost and inconvenience is no big deal, I can understand you just wanting to get on and enjoy your Morgan, just not something one usually expects to factor in in terms of the cost of "enjoying" the ownership of any modern vehicle...?
I am not too good at being "firm" myself generally..... But..?