# The Environmental Protection (Prescribed Processes and Substances) Regulations 1991, Paragraph 3

Extent: E+W+S

(1) In the case of an existing process, the prescribed date is—
(i) in a case falling within paragraph (2), the date at which the change mentioned in that paragraph is made unless later than the date applicable in accordance with sub-paragraph (ii);
(ii) where sub-paragraph (i) does not apply and subject to paragraph 5, the day after that on which the period for applying for authorisation in accordance with the Table in paragraph 4 expires.
(2) A case falls within this paragraph if the person carrying on the process makes a substantial change in the process on or after I April 1991 and that change—
(i) has not occasioned construction work which is in progress on that date; or
(ii) is not the subject of a contract for construction work entered into before that date.

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Source: https://www.legislation.gov.uk/uksi/1991/472/schedule/3/paragraph/3 (the official version)
Page: https://openlegislation.uk/environmental-protection-prescribed-processes-and-substances-regulations-1991/schedule-3/paragraph-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.