§ Mrs. Monksasked the Secretary of State for the Environment (1) what plans he has to alleviate the current shortage in building materials which is likely to increase because of the non-production of clinker ash;
(2) what long-term plans he has to find a substitute for clinker ash, the source of which is coming to an end, as a lightweight aggregate.
§ Mr. AmeryI am aware that supplies of clinker ash are declining. Alternatives are available but I am considering whether further investigations need to be made into possible replacements.