I went to an entertainment venue in Brighton last week and there were no single sex loos. There was a ‘women’s’ toilet and a ‘men’s’ toilet, both with a sign saying they were for use by anyone of any gender identity. So two mixed sex toilets, one with urinals. Predictably, the women’s had a massive queue (of women), the men’s had hardly any queue and was only being used by men as far as I could tell.
There was also a sign in the ladies about respecting staff and fellow patrons etc and saying that leaving leaflets/stickers in the loos wouldn’t be tolerated. (I wish I’d taken a photo because I can’t remember how they phrased it- they didn’t say leaflets or stickers but it was clearly what they meant).