SCHEDULE Authorised fuels
49 Newheat briquettes, manufactured for Oxbow Coal B.V at Newfield works, Bishop Auckland, County Durham, which—
(a) comprise petroleum coke (as to approximately 60 to 65% of the total weight) and anthracite (as to approximately 30 to 35% of the total weight) together with 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 pillow-shaped oval briquettes;
(d) have an average weight of 100 grams per briquette; and
(e) have a sulphur content not exceeding 1.9% of the total weight.