The Prime Minister praises Environment Agency staff on a visit to the floods in southwest England .
Prime Minister David Cameron has said the government is doing "every single thing we can" in what he said "is a very tough situation caused by some of the most severe weather we've seen for many, many years".
He also backed the chairman of the Environment Agency, Lord Smith, after calls for him to resign, saying, "this is not the time to change personnel here, this is the time to get on and do everything we can to help people.
"I back the Environment Agency, I back the work they're doing ... that's all I'm interested in at the moment."
"Right now everybody's got to focus at the job in hand", he added.
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