Haven’t read the whole thread but saw people are discussing Health&Safety regs. A big bug bear of mine is that EHRC and others talk about ‘lockable’ toilets or ‘secured from the inside’.
This isn’t what people think it means.
It just means if you pushed the door it wouldn’t open. It does not mean you can’t get in from the outside. You are supposed to be able to get in from the outside easily in case someone needs help. That sometimes means a coin to flip the lock or a hinge mechanism.
In real life, unless someone is shouting loudly for help (mixed sex toilets are supposed to be completely private and sound resistant too) then what happens is that people collapse and it’s about body retrieval. People can be left for days depending on cleaning schedules etc.
Of course it also means this private, mixed sex design is ideal for criminal activities on another person. The victims overwhelmingly being women, boys and girls.
The only toilet design in building regulations that isn’t completely private and sound resistant can be single sex toilet cubicles. The ones that open out onto a common area may have to be fire doors though.
Single sex toilet cubicles with door gaps are more hygienic too. Ventilation and the ability to clean under doors and partitions means there are less airborne and surface pathogens. It means the occupant can assess who is in the immediate vicinity and make a judgement as to whether they are a threat.
The old British Standards discussed that gaps above and below the door were needed for ventilation, cleaning, supervision and the prevention of wilful misuse. And safety locks were required especially for elderly, children and disabled.
In single sex designs this was a 15cm gap from floor to door. That’s enough to see how many are in the cubicle, if anyone has collapsed or in danger, and enough to prevent a lot of ‘wilful misuse’.
It’s a reasonable adjustment to have gaps under public toilet doors for the safety of millions with epilepsy, diabetes, heart conditions, who’ve had strokes.
Single sex toilets are the only designs that can have door gaps - if there’s ambiguity, the design then becomes private.
Mixed sex private designs are more dangerous for everyone, but healthy men are the least disadvantaged.