British Prime Minister Keir Starmer is facing criticism for blocking a bill that would ban first-cousin marriage due to mounting health concerns. Conservative MP Richard Holden argued that first-cousin marriage carries significant health risks and has negative impacts on society and women's rights. The prime minister's office did not provide a reason for opposing the bill, but a spokesperson for Starmer stated that the government is focused on delivering on issues that matter to the British public. The failure to ban interfamily marriage among first cousins has sparked outrage among conservative voices in the UK.