This section applies where a claim is brought under section 57 and the claim is that the respondent—
(a) has committed an act of discrimination, on grounds of race or ethnic or national origins, which is unlawful by virtue of any provision referred to in section 1(1B)(b) to (d), or Part IV in its application to those provisions, or
(b) has committed an act of harassment.
Where, on the hearing of the claim, the claimant proves facts from which the court could, apart from this section, conclude in the absence of an adequate explanation that the respondent—
(a) has committed such an act of discrimination or harassment against the claimant, or
(b) is by virtue of section 32 or 33 to be treated as having committed such an act of discrimination or harassment against the claimant,
the court shall uphold the claim unless the respondent proves that he did not commit or, as the case may be, is not to be treated as having committed, that act.