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The charity said it was important for Sentebale to "build credibility" in the US and that the project had "successfully delivered against every deliverable".

Designing and assembling a deliverable weapon would, however, take several months to a year or more, he told the BBC.

But they are deliverable, argues the CCC, without people having to scrap their existing boiler or car early.

Energy bills went up in January and are expected to rise again in April and Miliband has faced repeated questions about whether that pre-election promise is deliverable.

The Department of Health and Social Care said the government inherited a "crumbling NHS" and the new timeline was "realistic and deliverable".