Paragraph 3

If on investigating any matter the Board form the opinion that an act has been done which is unlawful by virtue of any provision of Part I of this Act and either they are unable to secure such a settlement and assurance, or, as the case may be, such an assurance, as aforesaid, or it appears to them that the act was done in breach of a relevant assurance, they shall determine whether or not to bring proceedings under section 19 or 20 of this Act.