“… if an employee or worker is put at a disadvantage and treated less favourably because of their menopause symptoms, this could be discrimination if related to a protected characteristic…”
Well it won’t be related to a protected characteristic, will it? Reminiscent of the case Crenshaw studied in one of the early articles on the concept of intersectionality, if men between the ages of 45-55 are not disciplined for taking time out from work to deal with hot flushes, then there is no age discrimination. And if women outside those ages are not disciplined in this way, there is no sex discrimination.
If the menopause has nothing to do with women stopping ovulation, it’s just a load of nothing, really.