123. (1) The Commission, whether for the purpose of section 122(4)(e) or of its own volition, may, in order to ascertain whether an infringement has occurred or is occurring, cause such inquiry as it thinks fit to be conducted for that purpose.

(2) The Commission may, for the purposes of subsection (1), where it considers it appropriate to do so, in particular do either or both of the following:

(a) cause any of its powers under Chapter 4 (other than sections 134 and 135) to be exercised;

(b) cause an investigation under Chapter 5 to be carried out.