Part 1: Digital Markets Chapter 4: Pro-Competition Interventions Section 48: Procedure relating to PCI investigations
This section describes how and when the CMA should give notice to the relevant designated undertaking of the initiation of a PCI investigation. The CMA is under a duty to publish as soon as reasonably practicable a PCI investigation notice provided to the designated undertaking under investigation, subject to necessary redactions for confidentiality reasons.
	Subsection (2) sets out the information that the PCI investigation notice must include. This includes a description of the CMA’s grounds for suspecting that there is an adverse effect on competition and the purpose and scope of the investigation in relation to the designated undertaking and the digital activity.
	Subsection (3) allows the CMA to update the PCI investigation notice if it has refined its view of the purpose and scope of the investigation, such as if the activity has changed since the earlier notice was given to the designated undertaking. For example, the CMA could give notice that it is narrowing or extending in a limited way an investigation in relation to the digital activity as a result of its assessment of evidence gathered during the investigation. This may not change the general nature of the scope and purpose of the investigation as a whole and does not change the date on which the investigation begins (see section 50(3)).
	Subsection (4) places a duty on the CMA to publish a statement summarising the contents of the investigation notice as soon as reasonably practicable following the initiation of the investigation. This notice could summarise the contents of the notice provided to the relevant designated undertaking, for example by redacting some information for confidentiality purposes.