"A person discriminates against a woman in any circumstances relevant for the purposes of any provision of this Act if-- (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
"21. In relation to the applicant's complaint of unlawful discrimination, the Tribunal accept the applicant's submission that the School had imposed a condition or requirement to the effect that a teacher had to be employed on a full-time basis to escape selection for redundancy in these particular circumstances.
"Even if the Tribunal had concluded that a considerably smaller proportion of female teachers were able to work full-time and that this also applied to the applicant, the Tribunal would still have rejected the applicant's complaint of sexual discrimination for this reason. On the evidence presented the Tribunal are satisfied that there was a justifiable non-gender basis for imposing such a requirement - namely a need to retain an essential degree of flexibility to enable the School to provide the very high quality of education for which it is nationally renowned. The Tribunal do not suggest that this particular respondent should be treated more favourably because of its reputation. The Tribunal's determination on this point is simply that the respondent's methods of pursuing its acknowledged excellence as an educational establishment justified the policy of engaging part-time teaching staff to enable the respondent to cope with inevitable fluctuations in demand in respect of various subjects and that it was consistent with this policy for part-time teachers to be made redundant before full-time teaching staff when there was a reduction in the requirements for certain lessons due to pupils exercising their choice of subjects."
"The School were entitled to exclude the full-time teaching staff in the Modern Language Department from the pool of candidates for selection for redundancy for this reason. It was clear that the pupils' selection, in accordance with their options, had resulted in the School having to provide less [sic] French lessons. It was for precisely this sort of situation that the School had adopted a policy of engaging part-time teaching staff so as to minimise the disturbance to the teaching schedules of full-time teaching staff. The applicant had acknowledged that she accepted this policy and the Tribunal also regard it as fair and reasonable in the context of the objectives and very high standards which the School sought and had succeeded in achieving. ... In this instance, however, the School were simply implementing a machinery which had been devised for this very purpose and which the applicant accepted when she undertook her engagement."