Think the unthinkable, the thing that scares you to think about several times a day.

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Against that background, both parties need to be far more willing to think the unthinkable.

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New Labour licensed Mr Field to think the unthinkable about reforming the welfare state Old Labour had invented.

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South Koreans have started to think the unthinkable, that their team could reach the finals, and even win.

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"You need to think about the unthinkable, " says Scott Mather, head of global portfolio management at Pacific Investment Management Co.

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So, a leading representative of the Tory right is matching one part of the call made last week by the Liberal Democrat Business Secretary Vince Cable to think the previously unthinkable on public spending.

BBC: liam fox