@Kimilybob
I would question the reason for their existence....if they existed.
They do exist. I have been one somewhere in the UK on my trips around in the past two years. A male toilet that simply had the sticker replaced with a 'toilet' sign and no sex designation.
I cannot give you a location because I travel a lot. But, the article states quite clearly where the one relevant to the thread was.
But do please crack on with your denial that they exist.
And it cannot be said any more clearer or any more times that they exist due to organisations taking a quick and no cost approach to have 'gender neutral' toilets that they may need for Stonewall points, or for funding from specific providers, or just fucking laziness.
You might also like to address your other enlightening posts about people who actually have told you the other reasons that 'gender neutral' toilets don't work in very practical ways.
But, maybe your aim here is just to admonish and denigrate others who hold a different opinion to yours.