The UK used to be a world leader in psilocybin research but, despite the calls of the Home Affairs Committee, leading researchers, charities, veterans’ organisations and the Royal College of Psychiatrists, we have shamefully fallen behind on breakthrough treatments for conditions such as post-traumatic stress disorder and depression, causing misery to millions of people in our country. Can the Prime Minister explain why this policy remains the responsibility of a Home Office that cannot give it the attention it deserves, and why it is okay that American, Canadian and Australian patients can access treatment that British patients cannot?