comprise tower duff (as to approximately 95 per cent of the total weight) and a resin-based binder (as to the remaining weight);

were manufactured from those constituents by a process involving cold cure roll-pressing;

are pillow-shaped briquettes marked with the letter “T” on one side;

have an average weight of 50 grammes per briquette; and

have a sulphur content not exceeding 1 per cent of the total weight.