Ah, I've found it!
The Sunday Times article is by Laura Dodsworth, whose photography project focuses on the experience of detransitioning women. It can't be reproduced in full here for copyright reasons, but this excerpt says a lot, I feel:
"I fear that the detransitioned women I interviewed are canaries in the coalmine. Not only for detransitioners, but for womanhood. They all, in some combination, found being a woman too difficult, too dangerous or too disgusting. “I put the problem inside myself,” says one, “when actually it is with how the outside world sees women who don’t conform to feminine norms.”
These interviews, and my wider research, have uncovered common themes of girls who felt they didn’t fit typical feminine stereotypes, and felt uncomfortable in today’s hypersexualised culture. High rates of sexual abuse, harassment, autism, self-harm, personal rejection of being lesbian and homophobia all play a part. Feminism has made life better for women, but is it any easier to be in possession of a female body?"
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One of the subjects of Laura Dodsworth's project spoke up, saying:
"A few painful and difficult things have happened to me that I think were behind me wanting to be a man and not be a woman. I know I was not in the wrong, but they are things I can’t talk about publicly. What I know now is that transitioning wasn’t the way to deal with those things. You go to the gender clinic and within a couple of months you’re on testosterone. The psychiatrist said I was trans. I thought if they prescribed me testosterone then I must be trans. Aside from general questions, no one explored if there were other issues or challenged me."