catkind - When it says case by case, is that transwoman by transwoman, or setting by setting?
TW by TW. The statutory code says,
13.60 - As stated at the beginning of this chapter, any exception to the prohibition of discrimination must be applied as restrictively as possible and the denial of a service to a transsexual person should only occur in exceptional circumstances. A service provider can have a policy on provision of the service to transsexual users but should apply this policy on a case-by-case basis in order to determine whether the exclusion of a transsexual person is proportionate in the individual circumstances.
And yes, it makes the exception almost impossible to use. The effect of is that if a women-only service wishes to use this exception and is legally challenged by a TW, the case becomes personal.
The test is no longer whether it's justified and proportionate for women to have female only space in a specific circumstance. The test is now whether this particular TW is 'woman enough' for female service users to be expected to turn a blind eye to their maleness and accept them personally into what was a female only space.
'Case by case' means that no-one has the right to run women only services any more. You can have it as a policy but 'case by case' overrules your policy so you can never guarantee female only space to your service users.
Statutory Code is not the law but carries a lot of legal weight. If a service provider was taken to court they would have to show very good justification for not following it.