The incumbent of any ecclesiastical parish shall not, with respect to his parishioners or persons dying in his parish, be under any obligation to perform a funeral service before, at, or after the cremation of their remains, within the ground of a burial authority, but, upon his refusal so to do, any clerk in Holy Orders of the Established Church not being prohibited under ecclesiastical censure, may, with the permission of the bishop and at the request of the executor of the deceased person, or of the burial authority, or other person having charge of the cremation or interment of the cremated remains, perform such service within such ground.