31. Excel+ briquettes, manufactured by Oxbow Coal BV at Newfield Works, Bishop Auckland, County Durham, which—
(a)comprise petroleum coke (as to 65 to 70% of the total weight), anthracite (as to 25% of the total weight) and a cold setting resin binder, hardener and low temperature stabiliser (as to the remaining weight);
(b)are produced at ambient temperature by a process involving roll pressing and cold curing;
(c)are unmarked square pillow-shaped briquettes;
(d)have an average weight of 100 grams; and
(e)have a sulphur content not exceeding 1.9% of the total weight.