An investigation has been launched after official emails about protocols used when the Queen dies were accidentally leaked by the Welsh government.
The conversation, which was marked as “official sensitive” was sent to a number of people internally but also to a former employee.
Within the email was a letter from a civil servant, which detailed concerns about a news organisation having confidential information about the plans.
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In 2017, The Guardian wrote an article about the secret plan for the days after the Queen’s death and Politico published a piece last year about details of Operation London Bridge – the procedure’s codename.
Despite the email being marked as official, the Welsh government said it “did not contain any operational information”.
A spokesperson for the permanent secretary, Andrew Goodall, who is the head of the Welsh Government Civil Service, said: “It was marked ‘official sensitive’ and should not have been shared.
“We take the issue of information and data security very seriously and this is now being investigated as a potential security breach.”
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