54(4)Every covenant, condition and power, declared to be implied or deemed to be contained in any instrument by this Act, shall, unless it is expressly negatived or modified in the instrument, have the same force and effect and be enforced in the same manner as if it had been set out at length in the instrument and, when a party to an instrument is bound by such a covenant, condition or power, such covenant, condition or power shall also bind his heirs, executors, administrators and assigns.