This is a massive result. Huge congratulations to Keira, Ms A, Susie Evans and their legal team. This is such an important ruling. 
I am really shocked at what the Tavistock have been doing tbh. Yes, this is about basic Gillick competence, but there's something even more shocking underneath.
In evaluating Gillick competence, a clinician needs to assess whether a child can understand, retain and weigh information presented to them, in order to come to a decision. However, this assumes that the clinician is trustworthy and providing reliable and accurate information.
That clearly, clearly hasn't been happening. Rather than presenting the risks, the total lack of any evidence of the benefits of blockers, or the mounting evidence of harm, the Tavistock (like, the people we expect to be the fucking experts here) have, for reasons known only to them, been presenting blockers as a fully reversible "pause" button. Despite a total lack of evidence to indicate that this is true.
If a doctor tells a child that a magic medicine has no side effects, will solve all their problems, make allv their wishes come true (and give them a free unicorn), would we be surprised if the child accepted to take the medicine? Probably not.
But given that puberty blockers are not a magic medicine and actually appear to make everything worse, why (no, really, why?) were clinicians - who we trust to provide honest, accurate information - misrepresenting the effect of blockers so much?
I suspect that the answer is institutional capture and pressure from lobby groups, but lobby groups are not experts. They are. They have comprehensively failed in their duty of care towards incredibly vulnerable individuals, resulting in irreversible damage to hundreds of children because they didn't have the courage to stand up to a bullshit ideology. They ignored and sidelined their safeguarding lead as they did so. And had the audacity to claim the moral high ground at the same time. This is not how psychologists and psychiatrists running a national service should be behaving. I'm completely astounded at their total incompetence.