Try sending them an e-mail with the details you have eg name, date and place, and asking them for any other details which may be given in the burial record. If you have the exact details they will usually do a quick, free, look up for you. Well they have for me in the past.
As for the exact location in the churchyard, have you thought of contacting the church? It is highly possible that there is no headstone to identify the grave, not everyone could afford to pay for one.
Emeltom