BRITAIN will spend 3% of GDP on defence with ten-year plan, set to be revealed in days, "unaffordable" without commitment.

Defence secretary John Healey revealed that the defence spend ambition was now a certainty in an interview with The Times .

The government's ten-year defence plan is set to be unveiled on Monday.

Sources said on Wednesday that the 3% of GDP target remained an ambition.

However, Defence Secretary John Healey has now told The Times: “In the next parliament this country will spend 3 per cent of our GDP on defence.”

Healey added: "It allows us to plan for the long term. It allows us to deal with the pressures."

It remains unclear if the commitment has been agreed across Whitehall.

The defence spending review, which was due to be published on VE Day, was reportedly

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