John Denham says Vince Cable's 'integrity' will be questioned

Vince Cable told undercover reporters he had "declared war on Rupert Murdoch" and planned to block his efforts to take full control of BSkyB, according to the BBC's Robert Peston.

The business secretary's admission came in unpublished parts of a Daily Telegraph probe seen by the BBC.

The shadow Business Secretary, John Denham told the BBC: ''This is going to raise such a question about his integrity and his judgement''.