This controversy resurfaced recently, in the wake of a statement made by outspoken Brussels bureaucrat Jose Manuel Barroso.

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Certainly, given the broad range of APEC membership, such a strongly worded statement is likely to make uncomfortable reading in Brussels.

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The two men's differences on the issue were highlighted when the deputy prime minister did not attend the House of Commons on Monday for Mr Cameron's statement to MPs about using the veto in Brussels.

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