71   Effect of covenant with two or more jointly

(1)  A covenant, whether express, or implied under this or any other Act, and a contract by deed, and a bond or obligation by deed, made with two or more jointly, to pay money or to make a conveyance, or to do any other act, to them or for their benefit, shall be deemed to include, and shall by virtue of this Act imply, an obligation to do the act to, or for the benefit of, the survivor or survivors of them, and to or for the benefit of any other person to whom the right to sue on the covenant, contract, bond, or obligation devolves.

(2)  This section applies only if and as far as a contrary intention is not expressed in the covenant, contract, bond, or obligation, and shall have effect subject to the covenant, contract, bond, or obligation, and to the provisions therein contained.

(3)  This section applies only to a covenant, contract, bond, or obligation made or implied after the commencement of this Act.