"The next request is at page 30 and relates to the question of splitting Mr Ainsworth's salary in accordance with the history of his employment as set out in the Originating Application. Mr Bowers resists this and again points to the judgment of the Employment Appeal Tribunal in Enderby's case and particularly the remarks at paragraph 154 on page 60 and subsequent paragraphs where the Employment Appeal Tribunal comment on those paragraphs of the decision which are set out in paragraph 154. The views of the Industrial Members of the Employment Appeal Tribunal are given at paragraph 156. It seems to be that having regard to the general tone of the decision in Enderby's case and particularly those paragraphs raised in relation to the cross-appeal that the question of the splitting of a comparator's salary is not relevant. Accordingly I refuse to make an order for particulars which relates to the splitting of either Mr Ainsworth's salary or the salary of any other of the comparators should the point be raised in respect of them. I appreciate that in Enderby's case the matter was raised in connection with the market value of a certain group of employees because of their scarcity whereas here it is said to be required because of the work being on a rota basis an/or including night work and on flexibility provisions but it does seem to me that the same principles arise and that the pay of the woman and the pay of the comparator have got to be looked at as one sum and that it is not permissible to split them having regard to the judgment of the Employment Appeal Tribunal in Enderby's case."
"The Industrial Tribunal erred in law: (i) In failing to order the Respondents to supply Further and Better particulars of the way in which the variations between the salaries of the comparators Ainsworth, Parmenter, Joseph, Bowyers, Honey and Weyman and the salaries of the applicants were attributable to each material factor relied upon on the basis of the question of the splitting of a comparator's salary was not relevant.
"2 The Respondent is asked to specify what part of Mr Ainsworth's, Mr Bowyer's and Mr Parmenter's salary is attributable to each aspect of the history of his employment (page 4 of Request item (b) respectively).
"In giving its decision in interlocutory proceedings an industrial tribunal is exercising its discretion, but that discretion must be exercised within the powers given to the industrial tribunal on that issue and within the relevant legal principles which have been evolved largely through decisions of appellate courts. It is the exercise of a judicial discretion. It seems to us desirable, and indeed we would have expected, that the same principle would apply to interlocutory appeals as for final appeals even though the former will in the main be the result of the exercise of a discretion. Thus, in examining an interlocutory order of an industrial tribunal or of a chairman sitting alone we would define three issues: (a) Is the order made one within the powers given to the tribunal? (b) Has the discretion been exercised within guiding legal principles? (eg as to confidential documents in discovery issues; (c) Can the exercise of the discretion be attacked on the principles in Associated Provincial Picture Houses Ltd v. Wednesbury Corporation[1948] 1 KB 223 ?"