Mayor Boris Johnson says 174,000 men and women are missing out on an extra 35-pounds a week.
So as part of his "Know Your Rights" campaign, he's urging the capital's older residents - and their carers - to check they're getting all the payments they're entitled to.
The details now from Liz Wickham.
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A teenager who was mistakenly released from prison after he was arrested on suspicion of attempted murder has been detained by police.
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