For the purposes of an equal pay claim, how does the law interpret "like work" between a man and a woman?

A woman is employed on like work with a man if their work is the same or broadly similar and such differences as there are between their work are not of practical importance in relation to the terms of their work. The test is the nature of the job and not the specific tasks undertaken so, for example, a cleaner in a kitchen will do broadly the same work as one on a factory floor. In making a comparison it is necessary to have regard to the frequency with which differences between their work occur in practice and the nature and extent of the differences. If the man has a much wider range of duties than the woman this will constitute a significant difference, meaning that there cannot be a valid claim for like work.