38. HouseFuel Smokeless Ovals, manufactured by Maxibrite Limited at Mwyndy Industrial Estate, Llantrisant, Mid Glamorgan, South Wales, which—E+W+S
(a)comprise bituminous coal and petroleum coke (each as to approximately 10 to 15% of the total weight) and anthracite duff and starch binder (as to the remaining weight);
(b)were manufactured from those constituents by a process involving a roll-pressing and heat treatment at approximately 260°C;
(c)are unmarked pillow-shaped briquettes not exceeding 68 millimetres in length, 63 millimetres in width and 38 millimetres in height;
(d)have an average weight of 110 grams per briquette; and
(e)have a sulphur content not exceeding 1.9% on a dry basis.