Fire service staff have also been told that gender in fact is a set of behaviours.
Meanwhile, “sex is the label we’re assigned by a doctor when we’re born” the training material seen by The Telegraph says.
This label does not cover the “range of innate gender identities a person might have”, the material maintains.
The guidance has been slammed by Helen Joyce, director of Sex Matters, who disputes its “evidence-free” claims.
“It’s forcing an evidence-free ideological position on people who would be better off focusing on their jobs. That this nonsense is being peddled in an essential service like firefighting makes the story all the more depressing,” concluded Joyce.