16. Homefire ovals, manufactured by Coal Products Limited at Immingham Briquetting Works, Immingham, North East Lincolnshire, which–
(a)comprise anthracite duff (as to approximately 57 per cent of the total weight), petroleum coke (as to approximately 17 per cent of the total weight), bituminous coal (as to approximately 13 per cent of the total weight) and molasses and phosphoric acid as binder (as to the remaining weight);
(b)were manufactured from those constituents by a process involving roll-pressing and heat treatment at about 300°C;
(c)are pillow-shaped briquettes with two parallel indented lines running latitudinally around the briquette;
(d)have an average weight of 135 grammes per briquette; and
(e)have a sulphur content not exceeding 2 per cent of the total weight.