Here is what Sex Matters published on 7th May
https://sex-matters.org/posts/updates/workplace-toilets-know-your-rights/
Under the 1992 Workplace Regulations, most workplaces must provide single-sex toilets for their employees, as well as changing rooms and washing facilities where required. While toilets can be single-user fully enclosed rooms, the most common approach in larger workplaces is two or more cubicles inside an enclosed room, with handwashing facilities in a shared area, all behind a door marked either Male or Female. There will often be a unisex single-user accessible toilet as well.
and on their fact sheet it says this:
https://sex-matters.org/wp-content/uploads/2025/05/Workplace-toilets-factsheet.pdf
The Workplace (Health, Safety and Welfare) Regulations 1992
The Workplace (Health, Safety and Welfare) Regulations 1992 provides detailed regulations on this for employers in Great Britain. Regulation 20 requires that:
places
“Suitable and sufficient sanitary conveniences shall be provided at readily accessible places"
and that
“Separate rooms containing conveniences are provided for men and women except where and so far as each convenience is in a separate room the door of which is capable of being secured from inside.”
Regulation 21 requires washing facilities to be separate in a corresponding way, except when the washing is only of hands, forearms and face.
The Approved Code of Practice (ACOP) produced by the Health and Safety Executive (HSE) on workplace health and safety sets out further guidance. It says that "adequate" means that you have to provide enough toilets and washbasins for those expected to use them and:
“Where possible, separate facilities for men and women, failing that, rooms with lockable doors. ”
I don't see where there is any back tracking to be honest. Unless they asked specifically about a different Act to the Workplace Act. There seems to be something of a disconnect here.