Effect of decision that section 47 prohibition has not been infringed
53.—(1)  This section applies to conduct if the Commission has determined an application under section 51 by making a decision that the conduct has not infringed the section 47 prohibition.
(2)  The Commission must not take any further action in relation to the section 47 prohibition with respect to the conduct unless —
(a)it has reasonable grounds for believing that there has been a material change of circumstance since it gave its decision; or
(b)it has reasonable grounds for suspecting that the information on which it based its decision was incomplete, false or misleading in a material particular.
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(3)  No penalty may be imposed under this Part in respect of any infringement of the section 47 prohibition by conduct to which this section applies.
(4)  The Commission may remove the immunity given by subsection (3) if —
(a)it takes action under this Part with respect to the conduct in one of the circumstances mentioned in subsection (2);
(b)it considers that it is likely that the conduct will infringe the section 47 prohibition; and
(c)it gives written notice to the undertaking on whose application the decision was made that it is removing the immunity as from the date specified in its notice.
(5)  If the Commission has reasonable grounds for suspecting that information —
(a)on which it based its decision; and
(b)which was provided to it by an undertaking engaging in the conduct,
was incomplete, false or misleading in a material particular, the date specified in a notice under subsection (4)(c) may be earlier than the date on which the notice is given.