Iran's Foreign Minister Mohammad Javad Zarif, the US Secretary of State John Kerry and EU's Catherine Ashton have resumed "intense" nuclear talks after a break, according to Reuters.
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The study by the National Childbirth Trust and National Federation of Women's Institutes found a lack of staff left some women frightened.
Extracts released by 10 Downing Street suggest Mrs May will say the UK will not settle for a "half-in, half-out" policy.
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