The Supreme Court has given a clear explanation of how the test for indirect discrimination works, looking in particular at whether it is necessary to know why a group is disadvantaged by an employer's policy.


Indirect discrimination arises where an employer's provision, criterion or practice puts people sharing a protected characteristic at a particular disadvantage. In other words, it occurs where the employer treats everyone the same but such treatment disadvantages a protected group. Where this happens, the employer can justify the treatment if it has legitimate reasons for the provision, criterion or practice and has acted proportionately.

In many cases, it is obvious why one group is disadvantaged. For example, if an employer has a requirement that all employees must be at least six-feet tall, this will disadvantage women as a group because women tend to be shorter than men. Similarly, a rule that no employees can wear head coverings will tend to disadvantage Muslims, due to the fact that many Muslim women wear headscarves or veils.

But what happens where there is no obvious explanation for why an employer's provision, criterion or practice disadvantages a particular group? That was the issue in two cases considered by the Supreme Court.

Essop v Home Office

The issue in the first case was the test used for promotion in the Home Office, known as the core skills assessment (CSA). All candidates were required to sit the same CSA, but the pass rate for black and minority ethnic (BME) candidates and candidates aged 35 or older was much lower than the pass rate for white and younger candidates. There was no explanation why BME and older candidates failed the CSA more often. In order to make a claim for indirect race and age discrimination, was it necessary for Essop and others to prove the reason for the lower pass rate? Or was the simple fact of the lower pass rate enough?

Naeem v Secretary of State for Justice

The second case concerned pay scales for chaplains in the prison service. These scales increased with length of service, so everyone was treated the same. However, Muslim chaplains were only able to be engaged as salaried employees from 2002 onwards. Naeem claimed that the length of service pay scale was indirectly discriminatory against Muslim chaplains, who had lower average basic pay than Christian chaplains. He said this was due to the fact that Muslim chaplains could not be employed before 2002. The question here was whether it was necessary to show that the reason for the lower pay was related to the fact that Naeem was a Muslim.


The Supreme Court decided that it is not necessary to explain why a provision, criterion or practice disadvantages a particular group in order to show indirect discrimination.

In Essop, this meant that it did not matter why BME and older candidates were disadvantaged by the CSA by having a lower pass rate. The fact of the disadvantage was enough to show indirect discrimination. It was then up to the employer to justify its use of the CSA.

In Naeem, this meant that there was no need to show a direct link between being a Muslim and the reason why the length of service pay scale put Muslims at a disadvantage. The Supreme Court thought that this was a more obvious case than Essop, as there was actually some connection between being a Muslim and shorter length of service, due to the inability to be employed as a Muslim chaplain before 2002. Again, the employer then needed to justify its pay scale to avoid a finding of unlawful indirect discrimination.

The Supreme Court's judgment also set out a number of useful reminders about the test for indirect discrimination:

  • Indirect discrimination is all about achieving a level playing field and dealing with hidden barriers, which are not easy to anticipate or spot. There may be many different reasons why one group may find it harder to comply with a provision, criterion or practice than others.
  • There is no requirement for a provision, criterion or practice to put every member of the group at a disadvantage. For example, some women may be tall enough to meet an employer's height requirement, but it will still be indirect discrimination if more women than men are disadvantaged.
  • An individual claimant still must show that there is a causal link between the provision, criterion or practice and their own disadvantage, which is the same as the disadvantage caused to the group. For example, in Essop, his claim would not succeed if he failed the CSA because he simply failed to prepare or turn up at the right time.
  • The pool for considering the impact of the provision, criterion or practice should generally be all workers who are affected, whether positively or negatively. In Naeem, all chaplains were covered by the incremental pay scale and, therefore, all chaplains should be considered when assessing whether disadvantage exists, rather than just those employed from 2002 onwards.
  • It is always open to the respondent to show that a provision, criterion or practice is justified and there will be no finding of unlawful discrimination unless the justification fails.


Indirect discrimination has been a legal concept in the United Kingdom since the 1970s, so it may seem surprising that key aspects of the test are still being challenged in the courts. As the Supreme Court noted in its judgment: "Ideally, discrimination ought to be an easy concept, although proving it may be harder. But we do not live in an ideal world and the concepts are not easy, as these two cases illustrate all too well".


If the purpose of indirect discrimination is to level the playing field and remove hidden barriers for different groups, then this decision makes some sense. It should not matter why a particular practice causes a disadvantage. The fact of the disadvantage is what is important and that practice needs to be justified or removed if it places a barrier in the way of a protected group.

This decision is not particularly helpful for employers as it makes it somewhat easier for individuals to make an indirect discrimination claim. However, the news is not all bad. The judgment emphasises that it is always open to an employer to show that a provision, criterion or practice is justified, noting that:

"The requirement to justify a PCP [provision, criterion or practice] should not be seen as placing an unreasonable burden upon respondents. Nor should it be seen as casting some sort of shadow or stigma upon them. There is no shame in it. There may well be very good reasons for the PCP in question."

Although Naeem was able to show indirect discrimination, the Supreme Court was not willing to overturn the original employment tribunal's finding that the pay scale was justified in the circumstances – so ultimately his claim failed.

The Supreme Court's commented that a "wise employer" will monitor how its policies and practices impact on various groups and try to modify them if they have a disparate impact. This type of monitoring is particularly important for key employment decisions, such as recruitment, pay reviews, promotions and disciplinaries. A robust equal opportunities policy that is backed up by monitoring and manager training will always be a prudent approach.

For further information on this topic please contact Hazel Oliver at Lewis Silkin by telephone (+44 20 7074 8000?) or email ( The Lewis Silkin website can be accessed at

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