46. Unicite, manufactured by D.J. Davies Fuels Ltd, Blaenau Fuel Depot, Ammanford, Carmarthenshire, or manufactured by A.I. Simson, Cabby Latch, Logie by Kirriemuir, Angus, which—
(a)is a mixture of the following separate fuels—
(i)anthracite large nuts; and
(ii)Union briquettes of the description in sub-paragraph (d) manufactured by RWE Power A.G. at Cologne, Germany (as to no more than approximately 40 to 42 per cent of Unicite’s total weight);
(b)has an overall sulphur content not exceeding 0.5 per cent of the total weight; and
(c)in so far as it is constituted by the Union briquettes referred to in sub-paragraph (a)(ii), must consist of compressed lignite with each briquette measuring approximately 75 millimetres in width, 60 millimetres in height and 55 millimetres in length.