Where should transgendered people obey the call of nature?

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If you live in the United Kingdom, and are transgendered, you are free to use whatever public toilet facility you feel most comfortable with. There is no law to say that you must use the men's or the women's public conveniences. In practice, most transgendered people will use the women's toilets, because they dress and look like women and regard themselves as women for nearly all practical purposes. It also causes less embarrassment all round if they use the women's facilities. However, in Houston, Texas (and presumably in some other American cities) this is now illegal, thanks to a public vote. In practice it will probably make very little difference - who is is to know whether a person who looks like a woman and walks into a women's toilet was born female or has undergone a sex change?