SCHEDULE 1 Additional authorised fuels
12 Fireglo briquettes, manufactured by Les Combustibles de Normandie at Caen, France, and by La Société Rouennaise de Defumage at Rouen, France, which—
(a) comprise washed Welsh duffs (as to approximately 92 per cent. of the total weight) and coal pitch binder (as to the remaining weight);
(b) were manufactured from those constituents by a process involving roll-pressing and heat treatment at about 330°C;
(c) are ovoids with 3 lines on one side and are smooth on the other side and have an average weight of 30 grammes; and
(d) have a sulphur content not exceeding 0£8 per cent. of the total weight.