Send a message to the person who requested a photo of the grave monument of Henry Nantes with the following comment:
Henry is a relative of mine. My mother is a Nantes. Henry is listed in family documents as baptised 4 March 1804 (St Douglas, Isle of Man) died 1826. Father was Henry Nantes, born 1764 Bremen, Germany, died 1836 UK. A Merchant working in London he leased Kenwith Castle Farm, 56 acres near Bideford. So I'm almost 100% sure this is the right Nantes.