Currently, parents of children under 17, or under 18 if their child is disabled, can ask for more flexible working patterns,
But the law is likely to change extending the right to all employees, irrespective of whether they have a child.
Under the change, grandparents could apply for flexible working to help look after grandchildren.
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More than 80 prominent Britons, including Boris Johnson, Russell Brand and former Government ministers, urge Obama to release Aamer.
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