World Champion and Olympic gold medallist Mo Farah will face fellow distance-running greats Kenenisa Bekele and Haile Gebreselassie at the Bupa Great North Run in Newcastle today.
Farah will fire the starting pistol for the shorter 5km event, organisers said.
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A Met Office warning covering much of England and south-east Wales is expected to remain in place until 11am.
A band of cloud and patchy rain is expected across Scotland and Northern Ireland, moving southeast as the day progresses.