Just looked up the Bigland Transcripts of Littledean CoE Church St Elthelbert from this site, only relevant Graves may be:

"JOHN THOMAS 13 Oct. 1757 aged 47.
ESTHER, Daughter of JOHN and ELIZABETH THOMAS 22 Jan. 1766 aged 22."

and

"BEATA MOUNTJOY 19 Nov. 1745 aged 80."

From http://www.forest-of-dean.net/downloads/index.php?path=Bigland_Transcripts/

Hope this all helps, looking forward to your comments.