Watch BSkyB plummet

This is what happened to BSkyB’s shares just after the government announced it would back Labour’s motion on Wednesday calling for Rupert Murdoch to abandon his bid for the shares in the company he does not already own:

BSkyB share price

Labour officials tell us they think it would be “inconceivable” for Murdoch to continue his bid if there is a House of Commons majority against it. Investors obviously agree.