Sir Ranulph and his five-man team will cross the continent during winter over a six-month period. Going with them will be two machines to help carry their equipment.
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Cloud and outbreaks of rain will ease away eastwards during the morning, clearing the east coast around midday with sunny spells developing.
Police and emergency services are attending the scene.
Rebel-held east remains at risk while the pumping station supplying the western part of the city is once again in operation.