I had a look, but was unable to find the plot (no cemetery staff were present to provide guidance or a plot plan). There are relatively few markers, but I found one for Y5 which I took to be row 5 in block K, which had graves of the right vintage, and is indeed bounded by the main path. I counted 8 rows from there, but there were no Perkins graves in that row or anywhere nearby.
If you can get better directions, send me a PM and I'll have another look next time I'm there. Although I don't live anywhere near Axminster, I do go there from time to time (my mother still lives there, and my father and grandparents are buried there).