Tandora thinks that asking for the existing requirement for single-sex toilets to be respected is all going end in tears because businesses will just replace them all with 'gender neutral' toilets and things will be worse for women and we'll have nobody to blame but ourselves.
There have been many many well-informed discussions about regulations covering toilet provision, full of references and links to documents and so on, but it appears that Tandora hasn't read them.
I said upthread that separate men's and women's toilets are a requirement in building regs, 'universal' toilets are an optional extra EXCEPT where there is not enough space to provide separate single sex toilets. I linked to the appropriate document, did you see that Tandora? here it is again
Toilet accommodation: Approved Document T
Existing building tend to have what was always the standard configuration: separate women's and men's toilets, and third spaces which are accessible toilets for disabled people. Fourth spaces which are unisex toilets have been added in some buildings.
New building will have to have separate women's and men's toilets, and accessible/disabled toilets UNLESS there is insufficient space, in which case building regs compliant 'universal' toilets will suffice.
Why on earth would a business based in a building which already has the standard configuration of women's, men's, and disabled toilets rip out some of them - and in the case of the Barbican, it only seems to be women's toilets they are removing - and replace them with all-unisex toilets?
Why go to all that expense, all that upheaval, to degrade the quality of toilet provision for the majority of the population, in order to cater to the tiny tiny percentage of the population who are trans?
In addition, they may find themselves in breach of health and safety/workplace/equality regulations, which have clear requirements for the number and specifications of toilets in a building. So Tandora's prediction of fewer toilets and all of them gender-neutral has quite a few regulatory roadblocks to get over..
So why would anyone go to the expense of ripping out functioning and regs-compliant women's toilets and replace them with unisex toilets because a very small number of people say they prefer them?
Virtue signalling? Misogyny? Spite? It certainly doesn't make good business sense.