HC Deb 10 March 1971 vol 813 c123W
Dr. Miller

asked the Secretary of State for Scotland, in view of the fairly clearly established causal connection between soft water and heart disease what action he intends to take to harden such water and thus prevent the premature death of 500 people per year in the Glasgow area.

Mr. Gordon Campbell

The nature of the connection between soft water and heart disease is as yet too imperfectly understood to serve as a basis for seeking t harden water artificially.