Virgin said the passenger who tried to break into the cockpit of one of its planes en route to Indonesia was drunk.
The Virgin spokesperson confirmed that the plane was not hijacked.
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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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