17. Ecoal briquettes, manufactured by Coal Products Limited at Immingham Briquetting Works, Immingham, North East Lincolnshire, which—
(a)comprise anthracite fines (as to approximately 40 to 65 per cent of the total weight), petroleum coke (as to approximately 20 to 40 per cent of the total weight), char (as to approximately 0 to 10 per cent of the total weight), bituminous coal (as to approximately 0 to 20 per cent of the total weight), biomass (as to approximately 5 to 20 per cent of the total weight) and molasses and phosphoric acid as a binder (as to the remaining weight);
(b)were manufactured from those constituents by a process involving roll-pressing;
(c)are unmarked hexagonal briquettes having an average weight of 125 grammes; and
(d)have a sulphur content not exceeding 2 per cent of the total weight.