She had the advantage of being the government minister piloting the Bill through the Commons at the time and so her statements as to the meaning of the Bill are an important source which carrys legal weight in interpreting it.
Vera Baird (Solicitor General) also referred to, "real sex" as distinct to 'gender identity" in the session quoted:
Public Bill Committee
Thursday 11 June 2009
Equality Bill
(extract)
The Solicitor-General: I will give way, although I have an “angels on the head of a pin” sense about this debate.
Lynne Featherstone: The debate may hinge on a pin head but it is vitally important to a particular community. I am seeking reassurance from the Minister—although I know she feels she has probably already given it. I have constituents who are indeterminate and would not necessarily be identified as gender reassigned or as one sex or the other. They are somewhere in between and unidentifiable physically. I want to make sure that those people are protected. They may not even be on a journey; they may just be indeterminate in their gender identity, so there is no reassignment at all. Would that be covered?
The Solicitor-General: We have not found evidence of discrimination against people who one might call third sex. We have not found discrimination against people like that at all. What causes discrimination is characteristics that other people can see. A state of indecision within oneself or a tentative reflection on where one wants to be on the spectrum will not light itself up so that somebody can discriminate against the person who is thinking or feeling that way.
Column number: 171
Lynne Featherstone: I would argue against that point because there are people who are indeterminate or third gender of whom it cannot be said which sex they are and they face discrimination simply because they do not look quite as expected in either gender.
The Solicitor-General: We have not come across discrimination against any such people that has not been linked to a separation—however tentative, however temporary and however partial—of gender identity and real sex." (continues)
publications.parliament.uk/pa/cm200809/cmpublic/equality/090611/pm/90611s05.htm