The Tories’ attack dossier on Labour’s spending plans has been billed as “costed by Treasury officials”. Yeah, right.

Nearly every single one of the documents published today includes a phrase along the lines of: “Special Advisers have asked officials to make the following assumptions” — Sir Humphry code for “This wasn’t our idea and we wouldn’t have done it this way”.

Here’s a flavour:

Whatever your views on Labour’s spending plans …

… would you trust Tory special advisers or the Institute for Fiscal Studies?