(1) Where a case which has been referred to the Director under section 21-

(a) does not fall to be dealt with by way of mediation under section 24, or

(b) falls to be dealt with under this section by virtue of section 24(6),

the Director shall investigate the case and may, as part of that investigation and if the Director considers it appropriate, hear persons appearing to the Director to be interested.

(1A)

(a) Claims to have been discriminated against on more than one of the discriminatory grounds (other than the victimisation ground) shall be investigated as a single case, and

(b) claims to have been discriminated against on discriminatory grounds which include the victimisation ground may, in an appropriate case, be so investigated,

but a decision shall be made on each of the claims.