This Part applies to personal injuries actions relating to catastrophic injuries -

(a) that are brought on or after the commencement of section 2 of the Civil Liability (Amendment) Act 2017, or

(b) that have been initiated, and have not been concluded, prior to such commencement, and the actions to which this paragraph applies include an action in which the court has made an order of the interim nature referred to in clause (II) of section 51I(2)(b)(ii).