Sources predict ‘toe-curling’ revelations as more than 1,000 pages of documents relating to his appointment as US ambassador to be published

• Mandelson files show no mitigation of security concerns

At the Downing Street lobby briefing the PM’s spokesperson said the release of the Mandelson files today would be “an unprecedented piece of government transparency”.

He said that party political material would be included, despite precedent suggesting it should be included, and that some material had to be declassified to allow it to be published.

The broad scope of the [humble address motion – see 9.26am] has required the discovery, assessment, analysis and preparation of thousands of individual documents and messages.

This is a task that has involved every government department.

Yeah, I have changed what I would say. I wouldn’t say that phrase any more.

And I think that, you know, over the last few years, I think a lot of us, myself included, have thought about this question in quite some detail.