41.—(1) SEPA must on standard rules being revised give notice to an operator with a standard rules permit of the—
(a)revision,
(b)date on which the revision is expected to be published, and
(c)date on which the revision is expected to take effect.
(2) SEPA must after giving such notice publish the—
(a)revision,
(b)standard rules as amended by the revision, and
(c)date on which the revision will take effect.
(3) A revision will take effect—
(a)if it makes only minor administrative changes, on the day following the date of publication, or
(b)in any other case, twelve weeks after that date.