60. Newburn briquettes, manufactured by M&G Solid Fuels LLP, Wilton International, Wilton, Middlesbrough, TS90 8WS, which—
(a)comprise petroleum coke (as to approximately 56 to 57% of the total weight), anthracite (as to approximately 37 to 38% of the total weight), and a dry powder binder (as to the remaining weight);
(b)were manufactured from those constituents by a cold cure process using roller press;
(c)are unmarked pillow shape briquettes of 70 millimetres x 62 millimetres x 42 millimetres;
(d)have an average weight of 110 grams; and
(e)have a sulphur content not exceeding 2% of the total weight.