Should the United States now disrupt the British program due to its inability to supply D-5 missiles when and in the quantity called for by bilateral agreements, it could have a catastrophic effect on the viability of the U.K. Trident and severely strain relations between two key allied governments.

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He said that there was now an inability to match supply with demand and the problem lay with "training for jobs which simply are not there".

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The con of gold is that the inability to expand and contract supply in line with the economy can create problems.

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He said the Green Investment Bank had been "hobbled" by its inability to borrow and called for energy efficiency to be given "equal value" to energy supply in policy-making.

BBC: UK Politics