Hi Tony,
Sorry to hear that your arthritis is getting worse and that you may have change your car, I know it's a beauty of a car and wish I could afford to have it, it really does need to go to someone who's going to keep up the standard that you have.
You need to do what's best for you, but I hope you'll still keep in touch with rest of us rover 75 and MG nutters.
All the best with whatever you decide and keep well.
Regards,
Martyn