Warnings were ignored and processes rushed because No 10 had already made up its mind to let Peter Mandelson sail throughThe arrogance takes your breath away, even to the end. Sacked in disgrace for bringing shame upon those who trusted him, Peter Mandelson’s response, we now know, was to unsuccessfully demand half a million pounds of public money to go quietly, all while haughtily insisting upon his dignity as a servant of the crown. In other words, this week’s disclosures suggest Mandelson behaves in a tight corner pretty much exactly as bitter experience suggests he might. What they still don’t explain satisfactorily is why Downing Street, seemingly alone, failed to anticipate that.To understand what went wrong, imagine the three-step process by which he became ambassador to Washington as a sandwich: two bland slices of officialdom, representing the Cabinet Office’s initial efforts at due diligence and a deeper vetting process at the end, glued together with political filling. Take ...