In the definition of " housing association " in section 78 (interpretation) of the [1972 c. 46.] Housing (Financial Provisions) (Scotland) Act 1972 there shall be added at the end the words—
“where under the terms of the tenancy agreement or of the agreement by which the tenant became a member of the association or otherwise he (or his personal representatives) will be entitled, on his ceasing to be a member and subject to any conditions stated in either agreement, to a sum calculated by reference directly or indirectly to the value of the house.”.