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That's because with the new government nearly one year old, this Spending Review is also a one-off opportunity to show the private sector and international investors that it has a confident, deliverable vision.

One of the many “deliverables” for that contract is developing a long-term recovery plan.

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.