(1) Where a competent authority begins, on or after the date which section 13 comes into operation, an investigation into a suspected infringement of relevant competition law -

(a) where the investigation relates wholly to conduct, behaviour or any matter that took place before the 4th day of February 2021, the provisions of the Principal Act, the Act of 2014 and the Communications Regulation Act 2002, as the case may be, shall, notwithstanding the amendments made to those enactments by Parts 2, 3, 4 and 6, apply to the investigation as if those amendments had not been made, and

(b) where the investigation relates to conduct, behaviour or any matter that, in whole or in part, took place on or after the 4th day of February 2021, the provisions of the Principal Act, the Act of 2014 and the Communications Regulation Act 2002, as the case may be, shall apply to the investigation as amended by such provisions of Parts 2, 3, 4 and 6 as are in operation when the investigation takes place.