This blog post from a legal expert is useful http://ohrh.law.ox.ac.uk/uk-reform-of-gender-recognition-and-the-commission-for-equality-and-human-rights/
it spells out that the Equality & human Rights Commission's own guidance to allow people to access facilities for their gender identity is inconsistent with the law.
TheEquality Actcontains prohibitions on sex discrimination, and also discrimination against those possessing the protected characteristic of gender re-assignment.
A person can be a transsexual under the Equality Act without a GRC.
The Commission’s guidance states:
“Generally, a business which is providing … single-sex services should treat a transsexual personaccording to the sex in which the transsexual person presents(as opposed to the sex recorded at birth), as it is unlawful to discriminate against someone because of gender reassignment”
But their response to the GRA consultation states:
“15. Individuals are treated under the sex discrimination provisions of the EA 2010in line with their legal sex. Thus, a trans person with a GRC is treated as having the sex recorded on their GRC (and new birth certificate), while a trans person without a GRC is treated as having the sex recorded on their birth certificate. In both cases, they are protected from discriminationbecause of gender reassignment.”
In other words a male undergoing gender reassignment (aka a transwoman without a GRC) should not be discriminated against but treated like any other male
"The single-sex service provider has no obligation to serve that person. Indeed, to do so would be inconsistent with the single-sex nature of their service."
That our MPs, the EHRC, academics, media and orgs making policy on this do not understand or make clear this basic interpretation of the law is so bloody irresponsible 