52. Unicite, manufactured by DJ Davies Fuels Ltd at Blaenau Fuel Depot, Ammanford, Carmarthenshire, or manufactured by AI Simson at 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 (c) manufactured by RWE Power A.G. at Cologne, Germany (as to no more than approximately 40 to 42% of Unicite’s total weight);
(b)has an overall sulphur content not exceeding 0.5% 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 wide, 60 millimetres high and 55 millimetres thick.