SCHEDULEN.I.Authorised fuels

50.  Supertherm briquettes, manufactured by Coal Products Limited at Immingham Briquetting Works, Immingham, North East Lincolnshire, which—N.I.

(a)comprise a blend (in the proportion of 19:1 by weight) of anthracite and medium volatile coal (as to approximately 93% of the total weight), and cold-setting organic binder or a molasses and phosphoric acid binder (as to the remaining weight);

(b)were manufactured from those constituents by a process involving roll-pressing;

(c)are unmarked ovoids;

(d)have an average weight of 160g per briquette; and

(e)have a sulphur content not exceeding 1.5% of the total weight.