Most websites I'm reading state it's confidential and most of the time nobody needs know, even if you're under 16. Knowledge about the abortion isn't even passed onto your GP without your consent.
However, there is a section that goes on to say your information may have to be shared if your safety or the safety of someone else is at risk.
I cannot think of any situations where it would be appropriate to share information with anyone else about a woman's abortion. Especially not medical ones. So why is it even stated?