§ Mr. Bennett
To ask the Secretary of State for the Environment if he will make it his policy to require that the maximum permissible concentration of heavy metals in secondary liquid fuel burnt in cement kilns shall be no more than the maximum permitted concentration in coal burnt in cement kilns. 
§ Mr. Clappison
There are no limits set for heavy metals in coal. Limits on the heavy metals in the secondary liquid fuels are set on the basis of trial results and the requirement to meet emission limits.