Prior to Nelson Mandela's admission to hospital with a recurrence of lung infection, he was reportedly suffering from a heavy cold.
According to one person who saw the former South African President on Tuesday, at that point there was no reason for any particular concern.
ITV News' Africa Correspondent Rohit Kachroo reports from Pretoria.
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British soldiers will join troops from some 30 countries who work in the country.
The demand comes after the Prime Minister urged a "grown up" relationship between her government and the devolved administrations.
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