asked the Secretary of State for the Environment which local authorities have notified him of their intention to demolish houses or flats built by industrialised or semi-industrialised systems; how many units of housing are involved; and what were the original costs.

I shall answer this question shortly.

asked the Secretary of State for the Environment how many local authority housing units have been built by industrialised and partly industrialised systems.

No complete record exists, but information available suggests that since 1919 about one million local authority houses and flats have been built by proprietary industrialised and partly industrialised systems in England and Wales.