What can I do about these toilets?

[PlayerOneNotReady]

I've changed jobs fairly recently and now work in a trendy converted warehouse. The office space is rented, and the toilets aren't for our exclusive use, they can be used by anyone in the building.
The toilets are set out like the diagram, and the doors for each cubicle are floor-to-ceiling. I'm not very happy about this layout, and I know that other people I work with aren't happy either (including my boss). But we're all just putting up with it.
It really looks like they were originally going to make two completely separated spaces, then changed their minds. If it was meant to be one space then why put in 2 showers (and less loos as a result)?
I think that the layout is contrary to the Equalities Act, so I'd like to put in a complaint to whoever owns the building, but I can't find the relevant bit of wording, can anyone help?
The other thing is that last week; someone came into the toilets and stopped outside the door of the loo I was in (I could see their shadow on the floor and heard their footsteps), then walked off. When I came out the only occupied cubicle was on the menz side. Was seriously weirded out.

As far as the toilets go, if they are completely enclosed cubicles with a sink inside, and if the women's cubicles include a sanitary bin, they meet the current code. If the sinks are in the middle of the room, they don't meet code and you can talk to HR, your union, and to ACAS.
Showers should be within a single sex room.

www.talk-business.co.uk/2018/09/19/what-facilities-does-an-employer-legally-need-to-provide/

Thanks Inebriati, that's very helpful. The cubicles don't have their own washbasin, but the wording on the link doesn't specifically say that the washbasin has to be in the lockable room with the toilet, only that washbasins etc. must be provided. So I wonder if they'd say that the facilities actually do meet the terms of the EA?

It's not the EA that sets the law on this. It's The Workplace (Health, Safety and Welfare) Regulations 1992

I would like this either, but I think it meets legal standards, unfortunately.

I'd be asking that a simple wall be put up. Only thing needed to be moved would be the dryer, with another one added.
They wouldnt listen though.

It's all so fecken enraging.