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What is ‘DV’? Key terms used in the Mandelson vetting row explained
UK NewsPolitics•April 28, 2026 at 9:48 AMNational

What is ‘DV’? Key terms used in the Mandelson vetting row explained

By Henry Dyer and Jamie Grierson•The Guardian - UK News

Phrases used by the UK’s national security apparatus have been thrown into the spotlight by the political controversyUK politics live – latest updatesThe story of how Peter Mandelson failed his UK security vetting before he took up his post as ambassador to the US – and the overturning of the decision that he should not be given clearance – is full of the abbreviations of the British national security apparatus and the archaic language used to describe parliamentary process.Here are the key terms to understand about the story, as Morgan McSweeney and Philip Barton answer questions from the foreign affairs select committee. McSweeney, formerly Keir Starmer’s chief of staff, and the ex-Foreign Office chief Barton are giving evidence about who knew what, when. Continue reading...

Phrases used by the UK’s national security apparatus have been thrown into the spotlight by the political controversy

The story of how Peter Mandelson failed his UK security vetting before he took up his post as ambassador to the US – and the overturning of the decision that he should not be given clearance – is full of the abbreviations of the British national security apparatus and the archaic language used to describe parliamentary process.

Here are the key terms to understand about the story, as Morgan McSweeney and Philip Barton answer questions from the foreign affairs select committee. McSweeney, formerly Keir Starmer’s chief of staff, and the ex-Foreign Office chief Barton are giving evidence about who knew what, when.

Continue reading...