BBC:
The chief Treasury civil servant wrote to Labour two days ago saying that the Conservatives’ assessment of their tax plans "should not be presented as having been produced by the civil service".
The letter from James Bowler, the Treasury permanent secretary, risks undermining Rishi Sunak’s claim in last night’s debate that Labour’s plans include £38bn of uncosted spending, which he says would mean £2,000 of tax rises per working household.
In a letter to Darren Jones, the shadow chief secretary to the Treasury, Bowler writes: "As you will expect, civil servants were not involved in the production or presentation of the Conservative Party’s document 'Labour’s Tax Rises' or in the calculation of the total figure used ... the £38bn figure used in the Conservative Party’s publication includes costs beyond those provided by the Civil Service".
"I agree that any costings derived from other sources or produced by other organisations should not be presented as having been produced by the Civil Service," he adds.
For context: Last night, Sunak repeatedly claimed that Labour's spending plans would result in a £2,000 tax rise for Britons. As our colleagues at BBC Verify pointed out, the Conservatives have come up with this figure by adding up how much they claim Labour’s spending plans would cost, and dividing this by the number of UK households with at least one person working.
Sunak said the costings had been worked out by impartial civil servants, but it was put to Energy Secretary Claire Coutinho this morning that they are actually based on costings fed to the Treasury by so-called spads (special advisers).