(1) An authorised officer may -

(a) enter at all reasonable times any premises or place where he has reasonable grounds for supposing that any employee is employed,

(b) there make any examination or enquiry necessary for ascertaining whether this Act has been or is being complied with,

(c) require an employer or his representative to produce any records which the employer is required by this Act to keep, and inspect and take copies of entries in the records.

(d) examine with regard to any matters under this Act any person whom he has reasonable cause to believe to be or to have been an employer or employee and require him to answer any questions (other than questions tending to incriminate him) which the officer may put relating to those matters and to sign a declaration of the truth of the answers.

(2) The powers conferred on an authorised officer by subsection (1)(a) shall not be exercisable in respect of a private dwelling house unless the Minister (or an officer of the Minister appointed by the Minister for the purpose) certifies that he has reasonable grounds for believing that an offence under this section in relation to an employee employed in the house has been committed by the employer, and the authorised officer in applying for admission to the house produces the certificate.