This is not a new thing, it has been known since before the 2000s, and was written extensively about by Fausto-Sterling in her book Sexing The Body. Doctors -- even today -- routinely withhold this information from intersex children, believing that it is for their own good. Unlike the article's suggestion, it is a widespread practice not limited to the UK.

A fun fact about the idea that you can ask for your medical records, is that the staff may redact any information they think would be harmful to you.