Where by virtue of this Measure or any scheme or order made thereunder any land is vested in the Commissioners, the diocesan board of finance, the Redundant Churches Fund or an incumbent of a benefice, the Commissioners may determine the boundaries thereof by an instrument under their seal, and such determination shall for all purposes be binding on any of the said bodies and any incumbent, whether as the body or person in whom the land is vested or the body or person from whom it is transferred, but shall bind no other person.

A copy of any such instrument purporting to be certified by an officer of the Commissioners as a true copy shall be sufficient evidence in any proceedings of the contents of the instrument.