# The Smoke Control Areas (Authorised Fuels) (Wales) Regulations 2019, Paragraph 88

Extent: E+W

Sovereign briquettes, manufactured by Monckton Coke & Chemical Company Limited at Royston, near Barnsley, South Yorkshire, which—
(a) comprise anthracite (as to approximately 75% of the total weight), coal and reactive coke (as to approximately 21% of the total weight) and cold-setting resin binder (as to the remaining weight);
(b) were manufactured from those constituents by a process involving extrusion;
(c) are unmarked hexagonal briquettes;
(d) have an average weight of 130 grams; and
(e) have a sulphur content not exceeding 2% of the total weight.

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Source: https://www.legislation.gov.uk/wsi/2019/50/schedule/paragraph/88 (the official version)
Page: https://openlegislation.uk/smoke-control-areas-authorised-fuels-wales-regulations-2019/schedule/paragraph-88
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.