Puberty Blockers

Angus MacDonald Excerpts

Tuesday 23rd June 2026 Commons Chamber

[Mr Angus MacDonald (Inverness, Skye and West Ross-shire) (LD)]

It is a great shame that this debate has been broken up along party lines. It should have been had as the debate on assisted dying was, where people from across the House could stand up and make their own case. Indeed, many Members from across the House have been supportive of what I am about to say.

Following the publication of the Cass review in 2024, the use of puberty blockers for gender dysphoria in children and young people was restricted by the then Secretary of State for Health due to an unacceptable safety risk, with their use limited to clinical trial settings. Polling by Whitestone Insight in ’25 showed that the public do not support a trial, with 67% of respondents agreeing that puberty blockers should never be given to under-18s, even as part of a clinical trial. That figure was 70% among parents of children under 18.

Like his predecessor, the Secretary of State has declared that he is uneasy allowing this trial to proceed, and cites clinical advice and a need for scientific evidence as a cover to allow him to support it. I have worked with many scientists, and we should be wary of thinking that all scientists are working for the betterment of the world. There were clinicians who said that the drug thalidomide was safe and clinicians who promoted lobotomies as a breakthrough mental health treatment. There were also clinicians who assured parents that puberty blockers were safe and reversible. It was in the name of science that clinicians prescribed puberty blockers to children at the Tavistock clinic for more than a decade, with an estimated 2,000 children receiving these powerful drugs. Where are these children now? How have they got on?

More importantly, I believe that as Members of Parliament, we have an overriding moral responsibility to protect the most vulnerable in our society, especially children. In our induction as MPs, we were told that we had a duty to speak out when things were wrong. It is clear to me that allowing possibly irreversible medical research to be carried out on 11-year-old girls and 12-year-old boys, when we know that some of these children at least will reconcile themselves to their biological sex at birth, is completely inhumane and uncivilised. Many of us feel uncomfortable about using beagles for medical research. How on earth can it be right to use children for irreversible and life-changing medical research?