# The Environmental Protection (Prescribed Processes and Substances) Regulations 1991, 

Extent: E+W+S

(a) Reforming natural gas.
(aa)Refining natural gas if that process is related to another Part A process or is likely to involve the use in any 12 month period of 1000 tonnes or more of natural gas.
(b)Odorising natural gas or liquified petroleum gas if that process is related to another Part A process.
(c)Producing gas from coal, lignite, oil or other carbonaccous material or from mixtures thereof other than from sewage or the biological degradation of waste , unless carried on as part of a process which is a combustion process (whether or not that process falls within Section 1.3 of this Schedule).
(d)Purifying or refining any product of any of the processes described in paragraphs (a), (b) or (c) or converting it into a different product.
In this Section, “carbonaceous material” includes such materials as charcoal, coke, peat and rubber.

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Source: https://www.legislation.gov.uk/uksi/1991/472/schedule/1/part/1/crossheading/section-11-gasification-and-associated-processes-1 (the official version)
Page: https://openlegislation.uk/environmental-protection-prescribed-processes-and-substances-regulations-1991/schedule-1/part-1/crossheading-section-11-gasification-and-associated-processes-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.