"(1) In determining for the purposes of this Part whether the dismissal of an employee was fair or unfair, it shall be for the employer to show- (a) what was the reason (or, if there was more than one, the principal reason) for the dismissal, and (b) that it was a reason falling within subsection (2) ...
"15. ... the lay members of the Tribunal are of the view that the Respondents did not have reasonable grounds upon which to sustain their belief and that there was not a reasonable investigation for the following reasons: ..."
"The majority members of the Tribunal conclude that the Respondents, in all the circumstances, failed to discharge the onus of demonstrating that they had acted fairly as set out in the British Home Stores Ltd v. Burchell test."
"It is then, thirdly, for the Tribunal to consider 'reasonableness', and to carry out the duty cast upon it by s.57(3). The history of this subsection shows that it had its origins in theIndustrial Relations Act 1971 and was maintained in force by s.1 and Schedule 1 of theTrade Union and Labour Relations Act 1974 . By para.6(8) of that Schedule the burden of proof was upon the employer; the relevant words were 'shall depend on whether the employer can satisfy the Tribunal that in the circumstances (having regard to equity and the substantial merits of the case) he acted reasonably in treating it as a sufficient reason for dismissing the employee'.