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The Guardian - UK
The Guardian - UK
National
Peter Walker Senior political correspondent

What the Mandelson documents reveal – and what we still don’t know

Mandelson speaks at welcome reception in Washington DC
Peter Mandelson was appointed as the UK’s ambassador to the US in December 2024, and was sacked in September 2025. Photograph: Carl Court/PA

We now have the first tranche of documents promised by the government connected to the appointment of Peter Mandelson as the UK’s ambassador to Washington – 147 pages from a mass of information believed to total in the hundreds of thousands.

Mandelson has previously denied any wrongdoing, and his lawyers have said he does not intend to make any further statement at this time. Here is what we have learned from the files – and what we do not yet know.

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