Hi John,
That sounds like a good lead John!
I was totally baffled reading Brian,& other accounts,they all seemed to think Mary bpt 1796,died 1864.was the "orignal" Mary.Just glad I went up & cleaned that headstone off, because that started to confuse me....the name Ann quoted on it,really!.I`d always believed it to be her by the date of death on that stone,1839,because prior,I`d come across her obituary from rootsweb, via Cornwall newspaper stating Mary,wife of capt Matthew Grose died 8th Jan 1839,aged 49.I have retained a copy.