Covenant to extend to executors, etc.
57.—(1)  A covenant relating to freehold land shall be deemed to be made with the covenantee, his heirs and assigns, and shall have effect as if heirs and assigns were expressed.
(2)  A covenant relating to leasehold land shall be deemed to be made with the covenantee, his executors, administrators and assigns, and shall have effect as if executors, administrators and assigns were expressed.
(3)  This section shall apply only to covenants made on or after 1 August 1886.