24. Homefire Ovals (R), manufactured by Coal Products Limited at Immingham Briquetting Works, Immingham, North East Lincolnshire, which—
(a)comprise anthracite fines (as to approximately 50 to 75 per cent of the total weight), petroleum coke (as to approximately 20 to 45 per cent of the total weight), bituminous coal (as to approximately 5 to 17 per cent of the total weight) and an organic binder (as to the remaining weight);
(b)were manufactured from those constituents by a process involving roll-pressing;
(c)are pillow-shaped briquettes with two parallel indented lines running latitudinally around the briquette;
(d)have an average weight of 130 grammes per briquette; and
(e)have a sulphur content not exceeding 2 per cent of the total weight.