I've just come across this while cruising the posts at ransom ~some fascinating stuff to be found!

Just a hunch but; " Public " suggests a Paupers burial. I believe I read somewhere how eg. Someone who died alone, in a council property, with no known relatives would be cremated by the council, who'd send their professional mourner along to see the deceased off ~ save the situation of absolutely no one being there. Might a Public plot not be similar?
" Subsequent " seems rather self explanatory; The word means 'following' or 'secondary', doesn't it? 'Others afterwards'? So; Second hand ground. Probably effected by a Lease. Ye pay the lease for, say 100 years. Then they leave ye alone for 100 years before popping in a
subsequent burial.
Which pretty much explains Freehold. Ye buy the Freehold of the plot and that's it. It's your bit of ground and they respect ye property rights in perpetuity and leave ye well alone.
Not claiming certain knowledge of any of this. But that's just how it sounds to me. Maybe there's some points there to springboard off into a search of Google?
