A spreadsheet containing the personal information of about 18,700 Afghans and their relatives – a total of about 33,000 people – was accidentally forwarded to the wrong recipients by email in February 2022, Healey told lawmakers in the House of Commons.

News of the data breach came to light when British Defence Secretary, John Healey, informed the parliament that the gag order banning the discussion, and that the Afghanistan Response Route had been closed.

Britain set up a secret scheme to bring thousands of Afghans to the UK after their personal details were disclosed in one of the country's worst ever data breaches, putting them at risk of reprisals from the Taliban after their return to power.