Part 1: Call-in for national security Chapter 4: Procedure Section 18: Voluntary notification procedure
In circumstances where there is no requirement to notify, section 18 provides a mechanism by which parties may voluntarily notify the Secretary of State of a trigger event in order to receive a call-in decision.
	Subsection (2) provide that a seller, acquirer or any qualifying entity concerned may give the Secretary of State a voluntary notice stating that a trigger event has taken place or that a trigger event is in progress or contemplation.
	Pursuant to subsection (4) the Secretary of State may by regulations prescribe the form and content of a voluntary notice.
	Subsections (5) to (8) provide for the process the Secretary of State must follow upon receiving a voluntary notice. In particular, the provisions set out the grounds on which the Secretary of State may reject a voluntary notice and the procedure which the Secretary of State must follow in responding to the relevant parties.
	Subsection (9) provides that the Secretary of State has 30 working days to review a voluntary notice once it has been accepted. Before the end of this period, the Secretary of State must decide whether to call in the trigger event or whether to take no further action under the Act and notify relevant parties accordingly.