The Smoke Control Areas (Exempted Fireplaces) (Scotland) Order 1999

2.  No fuel shall be used other than–

(a) untreated dry wood;

(b) peat or peat briquettes with, in either case, less than 25 per cent moisture;

(c) 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 per cent of the total weight;

(d) CPL Wildfire, manufactured by Coal Products Limited, Coventry, which comprise bituminous coal with a volatile content of 32 per cent to 36 per cent (as to approximately 96 per cent of the total weight) and a cold cure resin binder (as to the remaining weight); are manufactured from those constituents by a process involving roll-pressing; have an average weight of between 80 and 90 grammes or between 160 and 170 grammes; and have a sulphur content not exceeding 1.8 per cent of the total weight.