Puberty Blockers

Debate between Christine Jardine and John Hayes

Tuesday 23rd June 2026 Commons Chamber

[Sir John Hayes]

Baroness Cass certainly wanted to gather more evidence. The evidence we have shows the damage that puberty blockers can do. We know that the substantial science suggests that they affect bone maturation, cerebral capacity and, of course, fertility. It is certain that there is no compelling evidence that puberty blockers have a beneficial effect. That is why she sought more evidence, as she concluded that there was no compelling evidence that they have a beneficial effect.

[Christine Jardine]

As another member of the liberal working class, I wonder whether the right hon. Member has the experience that many of us in this place have of talking to constituents, friends and family who have children who have struggled with their gender identity and have benefited from puberty blockers. While he says that there is no evidence, many of us have direct experience of seeing the benefits in action.

[Sir John Hayes]

That experience clearly contradicts the Cass review’s findings, but it is for the hon. Lady to have that debate, no doubt, with Dr Cass.

What is certain is that we have no indication from the Government about what success in the trial will look like. When challenged on that subject, answer came there none. How will we gauge whether the trial is a success or a failure? Are these children really guinea pigs to be used to provide the evidence that the hon. Lady says is already freely available in her anecdotal experience of communicating with her constituents and others?

We know that there is certainly evidence from other countries. Have the Government looked to draw on that, rather than engaging in this dangerous trial? We know that there is evidence too from the 2,000 or more children who went through Tavistock. Some have suggested that we should look at the data already available rather than putting any more children at risk. Yet despite the Secretary of State’s agonised decision—I do not intend that to be sarcastic or pejorative; I appreciate that the Secretary of State was completely straightforward about how difficult it was to make the decision—the trial goes ahead. I accept that there are additional safeguards—this is not Tavistock; it is something different—but none the less it brings immense risk alongside the determination to try to gain facts. Instead, let us look at Finland and Denmark and at other countries that have already gathered evidence. Let us look at what we know of those who have already been through this process.

G. K. Chesterton said:

“children are innocent and love justice”.

I fear that this trial will steal their innocence and deny them justice. I hope that even at this late stage the Government, recognising that, will abandon this awful trial and save innocent children from that fate.