'Triple lock' graphic
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David Cameron pledges to 'protect' state pension

The state pension would continue to rise by at least 2.5% a year until 2020 if the Conservatives won the next election, David Cameron has said.

He pledged to keep the "triple lock" system, which ensures the state pension goes up by whichever is higher - inflation, wages or 2.5%.

Carole Walker reports.

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