The Deputy Chair of the Liberal Democrats has accused Boris Johnson of "extraordinary arrogance" after he announced plans to run for Parliament in 2015.
Sir Malcolm Bruce told ITV News it looked as though the Mayor of London was an "opportunist" who thought he could "walk in and out of Parliament" as he pleased.
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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.