"(1) A part-time worker has the right not to be treated by his employer less favourably than the employer treats a comparable full-time worker– (a) as regards the terms of his contract; or (b) by being subjected to any other detriment by any act, or deliberate failure to act, of his employer. (2) The right conferred by paragraph (1) applies only if– (a) the treatment is on the ground that the worker is a part-time worker, and (b) the treatment is not justified on objective grounds."
"(4) A full-time worker is a comparable full-time worker in relation to a part-time worker if, at the time when the treatment that is alleged to be less favourable to the part-time worker takes place– (a) both workers are– (i) employed by the same employer under the same type of contract, and (ii) engaged in the same or broadly similar work having regard, where relevant, to whether they have a similar level of qualification, skills and experience; and (b) the full-time worker works or is based at the same establishment as the part-time worker or, where there is no full-time worker working or based at that establishment who satisfies the requirements of sub-paragraph (a), works or is based at a different establishment and satisfies those requirements."
"14. The wording of regulation 2(4)(a)(ii) identifies the matters that must be inquired into. One must look at the work that both the full-time worker and the part-time worker are engaged in. One must then ask oneself whether it is the same work or, if not, whether it is broadly similar. To answer these questions one must look at the whole of the work that these kinds of worker are each engaged in. Nothing that forms part of their work should be left out of account in the assessment. Regard must also be had to the question whether they have a similar level of qualification, skills and experience when judging whether work which at first sight appears to be the same or broadly similar does indeed satisfy this test. But this question must be directed to the whole of the work that the two kinds of worker are actually engaged in, not to some other work for which they may be qualified but does not form part of that work. 15. It is important to appreciate that it is the work on which the workers are actually engaged at the time that is the subject matter of the comparison. So the question whether they have a similar level of qualification, skills and experience is relevant only in so far as it bears on that exercise. An examination of these characteristics may help to show that they are each contributing something different to work that appears to be the same or broadly similar, with the result that their situations are not truly comparable. But the fact that they may fit them to do other work that they are not yet engaged in, in the event of promotion for example, would not be relevant."
"43…… The sole question for the tribunal at this stage of the inquiry is whether the work on which the full-time and part-time workers are engaged is "the same or broadly similar"
"I can, I think, legitimately and possibly most helpfully, approach the problem in this way: by recognising that there is a component of the work load of the RMM which FPMMs do not do, which consists of tasks delegated by the Chief Medical Member and the Chamber President, the precise content and temporal scope of the component being subject to some fluctuation, but neither being insignificant in terms of time or importance."
"37. In addition to sittings and routine appraisals which I have already dealt with, the RMMs are about to take on a new role in relation to the large intake – some 257 – of new FPMMs this year. This will take the form of shared sessions in which the RMM is likely to sit on the first case in the list while the new FPMM observes with the roles being reversed for the second case after which the RMM gives immediate feedback. Thereafter the two alternate on cases in the list during the day. If the FPMM appears to be struggling the RMM will give advice and guidance and may arrange a second shared session. Given the numbers involved this is a very substantial burden on the RMMs with each having to do between 30 and 40 such sessions. As the appraisal scheme has been modified to include this new model it seems likely to be the pattern for the future. 38. So far as recruitment is concerned, in the two exercises which have taken place since the advent of RMMs, those of 2012 and 2013, the figures show the evolving nature of the involvement of RMMs on the one hand and FPMMs on the other. In 2012 six RMMs spent 26 days interviewing while 4 RMAs spent 22 days and an FPMM 5 days. In 2013 6 RMMs spent 45 days interviewing and 5 RMAs spent 36 days while 7 FPMM each spent only 2 days. There is an obvious logistical advantage in this as it takes far less administrative effort to deploy one salaried medical member than several FPMMs who have no obligation to participate. The RMMs were responsible for organising FPMMs to sit on the interviewing panels which were held across the regions. 39. So far as training is concerned, since the creation of the post of RMM the reliance on RMAs and FPMMs to act as facilitators has reduced but in addition, RMMs have begun to take up training roles not previously done by RMAs or FPMMs, for example an RMM has co-presented a lecture at induction training and all RMMs co-facilitated small groups of salaried judges at their 2013 annual conference which all RMMs attend with time set aside for their own training needs. RMMs cover local training events which would previously have been attended by the CMM."
"46. The single fact that the RMMs sit for such a large proportion of their time calls for a much closer scrutiny of the other part of their role. Using Mr Bourne's analysis of what Marshall requires me to consider which I have set out at para 12, some first answers are relatively easy to give. The differences between the two roles are largely qualitative rather than quantitative and there are no, or no relevant, differences between the levels of qualification, skill and experience between the two groups (ignoring the new intake who are not typical for this purpose). The extent to which the claimants' work is exactly the same as that of the RMMs is considerable – between 80% and 85%. That leaves only two questions for consideration, namely the relative importance of the work and whether the similarities are more or less important than the differences. Turning to the emphasised passages in para 44 of Baroness Hale's speech on which Ms Crasnow relies, there is no doubt that the work which both groups do, sitting, is of the highest importance to the enterprise as a whole. In summary then, in a single graphic proposition, the question which I have to answer appears to be this: does the importance of what the RMMs do which the FPMMs do not do, trump the fact that for most of their time the RMMs are doing work which is for practical purposes identical to the work of the FPMMs, that work of being of high importance? 47. This is very much a matter of drawing impressions from the findings of fact which I have made and before reaching my conclusions I have revisited and carefully reread those findings in order to gain as accurate an impression as I can. RMMs are not just FPMMs who take on additional tasks, that much is clear. It seems to me that they were designed to occupy a layer in the structure between those occupied by the CMM and FPMM at a level very much akin to that of the District Judge. While they are not in a technical sense the CMMs deputies within a region, important parts of her role are deputed to them – and not just the mechanical functions of carrying out appraisals or conducting interviews. I was impressed by the evidence of Judge Martin who, in my judgment, gave a thoughtful and detailed analysis both of the role and the thinking which lay behind it. The RMMS are people who have, or are in the processes of acquiring, a certain status, albeit that of first amongst equals, making them the focal point for the medical members in their region. They are the mentors, even tutors in a limited way, for newly appointed FPMMs and the bench markers for new jurisdictions such as Personal Independence Payments. They are beginning to take on an outward facing role in representing the jurisdiction with external bodies. None of this they have taken from FPMMs – it is delegated down to them from the CMM and the Chamber President. It is something which FPMMs have never done (or in the case of the mentoring of newly appointed FPMMs, not in this formalised, structured way) and sets the RMMs apart from them to a significant degree. The importance of this work to the enterprise cannot be doubted. RMMs are now the first port of call when a competition or training is to be organised and they are supplanting the FPMMs in dealing with appraisals and recruitment. 48. The workload of SSCS has grown substantially in recent years. Ms Crasnow contends that non-judges could have been appointed to undertake training, appraisal and recruitment but instead judges who, she submits are very like FPMMs have been appointed, implying, I think, that the non-sitting element of the RMM role is much like that of an administrator or HR officer. While I reject this comparison as significantly underestimating the nature and importance of the RMMs additional tasks, the submission seems to me to miss the point. A solution to the problem which the jurisdiction faced in 2010/11 could have been to delegate more widely among the FPMMs tasks such as appraisal, recruitment and training, and just take on some salaried medical members to sit full time. But what was done was to intentionally create an entirely new role which was qualitatively different from that of the FPMM and which brought a new dimension to the judicial structure of the jurisdiction. It took elements from below and above and an essential part of the thinking behind its creation was that it should relieve the pressure on the CMM. 49. In my judgment therefore the importance of what the RMMs do and which the FPMMs do not, does indeed trump the fact that for most of their time they do the same thing. They are not, therefore, engaged on work which is broadly similar."
"51. In my judgment this submission is doomed to failure by the choice of the sub-set. The net is cast far too wide and would, as Ms Crasnow accepted include a FPMM who had written a single article or attended a single meeting alongside the most active RMA who also took part in training and recruitment. Plainly, that can't be right and I understood Ms Crasnow to agree that the writing of a single article could not make a FPMM eligible for a pension if they were not otherwise eligible although it would seem to make them a member of her sub-set. It is simply unarguable, in my judgment that the additional work of the former is broadly similar to the additional work of the latter let alone the work of the RMM. In short it is not a valid sub-set. As I am offered no other sub-set as a basis for comparison, strictly that is the end of the matter, but I will add a short paragraph about the RMAs and others like them who also undertake activities such as training and recruitment on a regular basis (these last words being important) as, at least at first sight, they make a far more promising sub-set. 52. In my judgment had I been offered such a sub-set the comparison with the RMMs would still not have gone through because it ignores the importance of the qualitative distinction between the role of the RMM taken as a whole and that of the FPMM even taking into account what I might (rather disparagingly perhaps in order to make the point) describe as the mere mechanical similarities of the shared activities of appraisals etc which changes the ratio of the similarity of the work done by the two groups in favour of the RMAs. My reasons for this conclusion are set out in paragraphs 47 and 48 above."
"additional tasks are not in any sense attributable to the fact that the comparator's are full-time and the claimants are not" and the "additional duties are very much a deliberately designed element of the comparator roles all three of which are [Judicial Appointments Commission] appointments."