If in UK, ladies changing rooms in swimming pools and gyms are open, why are men allowed in if they say they are a woman?

Left-wing Americans, please only answer if you know about UK and its laws and changing rooms

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Why does anyone care? What does it matter. It isn't like it serves any purpose to have separate changing rooms anyway. Reguardless of gender or sex you're going into the room and closing and locking the door behind you anyway.