156.—(1) Where the tribunal finds that the complainant has unreasonably refused an offer by the employer which (if accepted) would have the effect of reinstating the complainant in his employment in all respects as if he had not been dismissed, the tribunal shall reduce or further reduce the amount of the basic award to such extent as it considers just and equitable having regard to that finding.
(2) Where the tribunal considers that any conduct of the complainant before the dismissal (or, where the dismissal was with notice, before the notice was given) was such that it would be just and equitable to reduce or further reduce the amount of the basic award to any extent, the tribunal shall reduce or further reduce that amount accordingly.
(3) Paragraph (2) does not apply in a redundancy case unless the reason for selecting the employee for dismissal was one of those specified in Article 132(1)(a) and (b), 133(1), 134 or 136(1); and in such a case paragraph (2) applies only to so much of the basic award as is payable because of Article 154.
(4) The amount of the basic award shall be reduced or further reduced by the amount of—
(a)any redundancy payment awarded by the tribunal under Part XII in respect of the same dismissal, or
(b)any payment made by the employer to the employee on the ground that the dismissal was by reason of redundancy (whether in pursuance of Part XII or otherwise).