The Queen is in "good spirits" and "good health" besides the symptoms of gastroenteritis, her spokesman has said. He added:
This is a precautionary measure. She was not taken into hospital immediately after feeling the symptoms. This is simply to enable doctors to better assess her.
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It ends a political standoff that briefly saw Yahya Jammeh and Adama Barrow claiming leadership of this tiny West African nation.
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The historic moment was watched by 500 people in the Church in Wales who cheered after the ceremony.