But South Korea is unlikely to want to apply any sort of real squeeze on North Korea over the nuclear issue until more negotiation has been tried first.

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However, the scenarios included multiple rounds of negotiation, so there was room for give-and-take: in a third experiment, with negotiation focused on a single issue, mimicry failed to have its desired effect.

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Mr Gray went on to say Scotland's public sector pay needed to be tackled - but stressed the issue must be taken forward with proper negotiation, such as what workers would get in return.

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The issue is a debate and a discussion and a negotiation with members of Congress over what kind of deficit reduction package we can get as part of this process.

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No one who follows these matters believes that this is the way the negotiation happened or is the real reason why Rick Scott flipped on the issue.

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However, if the dispute cannot be resolved through continuing negotiation, BBC Wales has said a legally-binding copyright tribunal will be used to resolve the issue.

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To be clear, Ms Merkel's assistance on the budgetary issue cannot be taken as a sign of support for Mr Cameron's broader platform of re-negotiation.

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