The GFHS Burial Index mainly covers 1813-1837 and Richard is therefore not listed. The following entry appears for a Sarah JAMES:
Date: 13 JAN 1820
First Name: SARAH
Surname: JAMES
Age: 95
Burial Register: LYDNEY 1813-1827
Place of Abode: FOREST OF DEAN

If this is the wife of Richard then a search of Lydney Registers would seem appropriate.

Mike