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BBCFears of more flooding along the River Thames in Oxfordshire and Berkshire have eased after water levels appear to have stabilised overnight.
But in Gloucestershire, more than 340,000 people remain without water supplies and there are fears about sanitation and health.
Mr Brown, on his second visit to the region since the floods on Wednesday, said great efforts were being made to help those without water but that supply needed to be stepped up.
The Environment Agency has six severe flood warnings in place - three on the Severn - in Gloucester, Tewkesbury and Worcester - two on the Thames around Oxford, and one on the Ock, near Abingdon, Oxfordshire.
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A girl aged 19 is still missing since Saturday.
The Health Protection Agency warns not to come into direct contact with flood water lest stomach bugs may be contracted - though the risk is considered low.
In Gloucestershire the Chief Constable denounces instances of water reselling at inflated prices by private "selfish" people.
BBC forecasters say more rain is to come in the hit areas on Thursday.
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