I am not aware of a plot map for the churchyard but that said, I didn't know there were transcripts of the headstones until I saw Angela's post (which prompted me to check my collection of photos)
I have E-mailed you a couple of photos that may help you track the plot down. My guess, looking at the photos, that it is the far (east) wall.
Hi Hugh
Thank you for your kind words, I am Still pottering around (Virtually) Looking forward to the cert six points next season.