§ Mr. Wardellasked the Secretary of State for Industry if he will list in the Official Report the commodities produced for sale in the United Kingdom in 1981 that contained dioxin.
§ Mr. MacGregorI assume that the hon. Member is referring to 2,3,7,8-tetrachlorodibenzo-p-dioxin rather than to the family of dioxins generally. I understand that this substance may be present as an impurity in trace amounts in an indefinite number of derivatives of higher chlorinated phenols.