Eleven years and $186 million into the public inquiry investigating the industrial-scale infiltration of political groups by British police, it seems that ministers are worried that we now all know too much.

Established in 2015, the Undercover Policing Inquiry was launched to investigate two secret units whose targets included such notoriously dangerous enterprises as the anti-apartheid movement and women’s liberation. Officers infiltrated their lives, formed sexual relationships with activists and spied on grieving families – including those of people killed by the police.