Buckingham Palace has confirmed the Queen has been admitted to hospital in London after experiencing symptoms of gastroenteritis.
All official engagements for this week will be either postponed or cancelled as a precaution, the Palace added.
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The family said that there will "always be a welcome in Wales" for the former intelligence analyst and whistleblower.
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Drivers' union ASLEF suspended industrial action scheduled for next week but the RMT Conductors' union strike remains in place.