"(1) A person discriminates against a woman in any circumstances relevant for the purposes of any provision of this Act if- (a) (is not relevant); (b) he applies to her a requirement or condition which he applies or would apply equally to a man but- (i) which is such that the proportion of women who can comply with it is considerably smaller than the proportion of men who can comply with it, and
"If I have to give some explanation of my understanding of that word, I would turn to a dictionary definition which says `to adduce adequate grounds for'; and it seems to me that if a person produces reasons for doing something, which would be acceptable to right-thinking people as sound and tolerable reasons for so doing, then he has justified his conduct'."
"The tribunal should look to the requirement or condition and see what it is which the respondent seeks to achieve. That object must be more than a matter of convenience. It is the subject of managerial decision. It must have a proper purpose when viewed within the whole of the business or organisation for which the respondent is responsible and wherein he or it may have duties or obligations. `Good and adequate reasons' per Stephenson LJ at page 674 (of Ojutiko).
"In deciding this issue the question of fact for the tribunal was whether the respondent had proved that the decision was justifiable, objectively justified for economic, administrative or other reasons unrelated to discrimination on grounds of sex, and in reaching that decision it was for the tribunal to carry out the broad balancing exercise."
"In my judgment `justifiable' requires an objective balance between the discriminatory effect of the condition and the reasonable needs of the party who applies the condition. This construction is supported by the recent decision of the House of Lords in Rainey v. Greater Glasgow Health Board[1987] ICR 129 a case under theEqual Pay Act 1970 ......'
"That is certainly true of the fact that on any view of the contractual relationship, the respondent was entitled to require Mrs Hillyard to work at the Sheerness office.'
"Having carried out the exercise of considering and balancing the various factors set out above, in relation to the defence of justification, we find that the respondents have established that defence. The requirement to work at Sheerness was discriminatory but has been shown by the respondent to be justifiable."