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First-cousin marriages has ‘benefits’, says NHS guidance despite birth defect risk

NHS guidance highlights cultural benefits of cousin marriage while critics cite doubled genetic disorder risks and call for a ban supported by 77% of Britons, a recent poll shows.

  • Last week, NHS England's Genomics Education Programme published guidance saying first-cousin marriage offers stronger family support and economic advantages but warned a ban would stigmatise communities.
  • Conservative MP Richard Holden introduced a bill to ban first-cousin marriage, backed by a YouGov poll showing 77 per cent oppose the practice this year.
  • Research shows children's genetic risk increases from 2%-3% to 4%-6% in children of first cousins, while the Born in Bradford study found an 11% speech diagnosis rate and 92.5% consanguinity among rare autosomal recessive disorder parents.
  • As of Monday, September 29, the guidance had been taken down from the website of the Genomics Education Programme, and an NHS England spokesman said it was a summary of existing research, not an official NHS view.
  • With the NHS under financial strain, genetic disorders linked to cousin marriage add urgency, while Britain favours education over bans unlike Norway, South Korea, and China.
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GB News broke the news in London, United Kingdom on Sunday, September 28, 2025.
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