After the week the government has had (the Liam Fox imbroglio, terrible unemployment figures), "cabinet minister caught throwing away secret papers in public bins" is not the sort of headline David Cameron wants to wake up to. The culprit is the gaffe-prone Oliver Letwin, who was seen disposing of private documents in a St James's Park bin. The Daily Mirror has the full story and the glorious pictures.

The paper reports that Cameron's Gandalf "was seen on five separate days throwing away sensitive correspondence on terrorism, national security and constituents' private details." In total, the Cabinet Office Minister disposed of more than 100 papers, including one said to describe how intelligence chiefs "failed to get the truth" on UK involvement in terrorist interrogations. A spokesman for Letwin has responded by insisting that the papers did not contain any sensitive material.

"Oliver Letwin does some of his parliamentary and constituency correspondence in the park before going to work, and sometimes disposes of copies of letters there. They are not documents of a sensitive nature," he said.

But Labour has already gone on the attack. In a letter to the outgoing cabinet secretary, Gus O'Donnell, Michael Dugher, Letwin's shadow, wrote: