I think you will find that the Camperdown Cemetery Trust is responsible. I suspect that the church has representation on that body, but I think you will find it is something other than a church graveyard. The following site gives some historical background, and says that the Church of England Cemetery Company is the trust company with 200 £10:00 shares. What this means in practical terms I have no idea. I suspect your first approach should be to the minister of St. Stephens Newtown. The sexton of the church and the Australian Society of Genealogists have copies of burial records. Bob and Laurel Horton. St.Peters Cooks River History Group. http://unilearning.uow.edu.au/academic/referencing.swf