It's your spin that 'there isn't a blanket ban' means service providers have to assess whether to allow each trans individual access on a case by case basis rather than it meaning each scenario (eg toilets, changing room, service provided) should be addressed on a case by case basis.
Blanket bans are unlawful ...
Copy this phrase into Google ... human rights - blanket bans - court rulings
A blanket ban on the rights of trans prisoners has been found by the High Court to be unlawful. Likewise Scotland ...
Blanket ban on trans prisoners in female prisons not possible, MPs told
A blanket ban to prevent trans prisoners being housed in the female prison estate would not be possible under the current law, MPs have been told.
Public law expert Michael Foran said exclusions set out under the Equality Act, which allow services to stop trans women from accessing female-only spaces, are subject to proportionality and therefore a blanket ban would not be upheld by the courts.
Speaking to the Commons’ Women and Equalities Committee, Foran said: “The point of safeguarding law is that you have to deal with the exceptional case, because if the exceptional case was to happen and it would just be so awful – it would be so incredibly awful – that we need to have a system in place that prevents that from ever happening.
“If we think that, for example, the rape of a female inmate in a prison is one of those categories, then you need a blanket ban. There’s no other way to do it, and
you can’t do that under the current legal framework.”
The Committee was taking evidence on the Gender Recognition Reform Bill and its interaction with the Equality Act, following the UK Government’s decision to prevent the bill from becoming law.
Alister Jack, the Scottish Secretary, said the bill would have an
adverse impact on the operation of the reserved Equality Act.