Permitted Fuel: Selected washed coal doubles or Union Coal Briketts manufactured by Rheinbraun AG of Germany and comprising lignite compressed into briquettes of approximately 15 centimetres in length with square end

Selected washed coal doubles or Union Coal Briketts manufactured by Rheinbraun AG of Germany and comprising lignite compressed into briquettes of approximately 15 centimetres in length with square ends and with a sulphur content not exceeding 1%.