61. Newflame briquettes, manufactured by Maxibrite Limited at Mwyndy Industrial Estate, Llantrisant, Rhondda Cynon Taf, which—
(a)comprise anthracite fines (as to approximately 84% of the total weight), petroleum coke (as to approximately 12% of the total weight) and starch as binder (as to the remaining weight);
(b)were manufactured from those constituents by a process involving roll-pressing and heat treatment at about 260°C;
(c)are unmarked pillow-shaped briquettes;
(d)have an average weight of 78 grams; and
(e)have a sulphur content not exceeding 2% of the total weight.