Under Section 1 of the Equal Pay Act 1970, where a worker of one gender is engaged in like work (work of the same or broadly the same nature), if her job is rated as equivalent (under a proper non-discriminatory job evaluation study) or is of equal value in terms of skill, effort and judgment, as that of a worker of the other gender working at the same establishment (or vice versa) a claim for redress may be made to an industrial tribunal. The only exception is where an employer can demonstrate a genuine (non-sex related) material factor (GMF) differentiating the job and that of the comparator
Easyform Glossary of Law Terms. — UK law terms.