35. Supertherm II briquettes, manufactured by Coal Products Limited at Immingham Briquetting Works, Immingham, North East Lincolnshire, which—
(a)comprise anthracite (as to approximately 36 to 51 per cent of the total weight), petroleum coke (as to approximately 40 to 55 per cent of the total weight) and an 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 and have an average weight of 140 grammes; and
(d)have a sulphur content not exceeding 2 per cent of the total weight.