No10 knew Mandelson failed security vetting seven months ago
- Posted on April 17, 2026
- By The Independent
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- 1 min read
No10 knew Mandelson failed security vetting seven months ago

The Independent put revelations that Peter Mandelson had failed MI6 vetting for the US ambassador role to Downing Street in September – but a ‘furious’ Sir Keir insists he did not know until this week