§ Sir John Langford-Holtasked the Secretary of State for Energy which countries supplied the anthracite imported in each of the last five years, and in what percentages.
§ Mr. ParkinsonI have been asked to reply.
The principal countries from which anthracite was consigned to the United Kingdom since 1974 are as follows:
§ Mr. John MooreModern domestic hot water central heating boilers use a "closed" water circulating system so that the build-up of scale should be negligible with no loss of efficiency. Some older boilers and heating systems may suffer from scale formation, but there areno estimates of the resulting national waste of fuel. Proprietary descaling agents are available for use where scale is a problem, 203W and in such cases advice should be sought from service or advice centres belonging to the appropriate fuel industry.