jellyfrizz
they may be used by more than one person and a woman might object to the presence of a man (or vice versa)
Well yeah... It says that on page 16 of the Equality and Human Rights Commissions Guide but then they completely muddy the waters on the following page by stating:
Generally, a business which is providing separate services or single-sex services should treat a transsexual person according to the sex in which the transsexual person presents (as opposed to the physical sex they were born with), as it is unlawful to discriminate against someone because of gender reassignment. Although a business can exclude a transsexual person or provide them with a different service, this is only if it can objectively justify doing so.
A business may have a policy about providing its service to transsexual users, but this policy must still be applied on a case-by-case basis. It is necessary to balance the needs of the transsexual person for the service, and the disadvantage to them if they are refused access to it, against the needs of other users, and any disadvantage to them, if the transsexual person is allowed access. To do this may require discussion with service users (maintaining confidentiality for the transsexual service user). Care should be taken in each case to avoid a decision based on ignorance or prejudice.
Where a transsexual person is visually and for all practical purposes indistinguishable from someone of their preferred gender, they should normally be treated according to their acquired gender unless there are strong reasons not to do so
Where someone has a gender recognition certificate they should be treated in their acquired gender for all purposes and therefore should not be excluded from single sex services.
Usual muddle of "gender" and "sex" even in the same sentence there, but the final paragraph is a black-and-white rebuffal of the viewpoint that the GRA reform has no effect on single-sex spaces.