Glasgow City Council and Others v. Marshall and Others (Scotland)

Factual and Procedural Background

Eight instructors (seven women and one man) employed in special schools within The Region claimed that they performed work comparable to that of teachers but were paid substantially less. Their employer at the time of claim was Council A, the regional education authority. Following local-government reorganisation, successor authorities (“the Respondents”) became liable.

The instructors (the “Appellants”) lodged equal-pay complaints under the Equal Pay Act 1970. After a 52-day hearing, an industrial tribunal found (i) the instructors did “like work” with the teachers and (ii) the Respondents had failed to establish a defence under s.1(3) (“material factor” defence). The Employment Appeal Tribunal upheld that decision on the s.1(3) point.

The Respondents appealed to the Court of Session, limiting their challenge to the s.1(3) issue; that court allowed the appeal. The Appellants then appealed to the House of Lords, which produced the present judgment.

Legal Issues Presented

1. Whether, in the absence of sex discrimination, an employer can rely on different collectively-bargained pay structures as a “material factor” defence under s.1(3) of the Equal Pay Act 1970 to justify pay disparities between instructors and teachers performing like work.
2. Whether historic or “inertia-based” explanations for pay differences satisfy the causative requirements of s.1(3).
3. Whether indirect sex discrimination arose from the pay disparity, thereby requiring objective justification.

Arguments of the Parties

Appellants' Arguments

• The Respondents offered no positive justification for maintaining lower pay for instructors; mere historic practice and administrative inertia do not satisfy s.1(3).
• Lack of sex discrimination evidence is insufficient; the statute demands a “good and sufficient reason” for variation in pay once like work is established.
• Indirect discrimination exists because instructors are overwhelmingly female, whereas a significant proportion of teachers (when all schools are considered) are male.

Respondents' Arguments

• The disparity stems from two distinct national bargaining mechanisms: instructors are on the APT&C scale, teachers on the SJNC scale. That structural difference is a genuine, non-sex-related material factor.
• No evidence indicates that the pay scales or their application are tainted by direct or indirect sex discrimination.
• The Equal Pay Act does not require an employer to “justify” disparities once a genuine non-sex factor causing the difference is proven.
• The Appellants’ attempt to raise new indirect discrimination statistics at the House of Lords stage is procedurally inappropriate.

Table of Precedents Cited

Court's Reasoning and Analysis

The House, led by Judge Nicholls, reiterated the statutory sequence:

1. Once disparity in pay for like work is shown, a rebuttable presumption of sex discrimination arises.
2. The employer rebuts the presumption by proving four matters:
   1. The proffered factor is genuine.
   2. The factor causally explains the disparity.
   3. The factor is not “the difference of sex,” i.e., contains no direct or indirect discrimination.
   4. The factor represents a significant and relevant difference between the employees’ cases.
3. If the employer proves (a)–(d), s.1(3) is satisfied; no further “justification” is required.

Applying that framework, the Court found:

• The Respondents’ explanation—different national pay scales for instructors and teachers—was genuine and causative.
• No evidence suggested the scales or their allocation were infected by sex bias; the Appellants themselves accepted the absence of direct discrimination.
• Therefore, the Respondents established a complete s.1(3) defence. The industrial tribunal erred by demanding a separate “good reason” for the disparity and by treating lack of reassessment as fatal.
• The Appellants’ late indirect-discrimination argument would necessitate fresh factual inquiry. Given the advanced procedural stage and availability of parallel claims, the Court refused to remit.

Holding and Implications

Appeal DISMISSED.

Consequently, the instructors’ equal-pay claims fail. The decision confirms that, under the Equal Pay Act 1970, an employer who demonstrates a genuine, causative, non-sex-related factor need not further “justify” a pay difference. The ruling strengthens the authority of Wallace and clarifies that historical bargaining structures can constitute a sufficient s.1(3) defence when untainted by sex discrimination. No new precedent on indirect discrimination was set, but future claimants may still pursue that route in separate proceedings.