# The Smoke Control Areas (Authorised Fuels) Regulations 1991, Paragraph 17

Extent: E+W+S
Status: prospective

Sovereign briquettes, manufactured by the Monckton Coke & ChemicalCompany Limited at Royston, near Barnsley, South Yorkshire,which—
(a) comprise anthracite (as to approximately 75 per cent of the totalweight), coal and reactivecoke (as to approximately 21 per cent of thetotal weight) and cold-setting resin binder (as to the remainingweight);
(b) were manufactured from those constituents by a process involvingextrusion;
(c) are unmarked hexagonal briquettes and have an average weight of 130grammes; and
(d) have a sulphur content not exceeding 2 per cent of the total weight.

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Source: https://www.legislation.gov.uk/uksi/1991/1282/schedule/1/paragraph/17 (the official version)
Page: https://openlegislation.uk/smoke-control-areas-authorised-fuels-regulations-1991/schedule-1/paragraph-17
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.