Wow 121 year old stone marker. You should send a picture to the queen, she would probably have the whole graveyard cleaned up and looking nice again in no time. People like numbers she could have a new marker placed next to it 121 years and 121 days after the erection (she will love that word ;-} ), I Queen Elizabeth re-dedicate this hallowed ground. You could become even more famous.
I don't think the queen would be that bothered, I think there would be many such marker in the older graveyards.