Last week the ratings agency Fitch warned that the Government's missing its debt target "weakens the credibility of the UK's fiscal framework, which is one of the factors supporting the [AAA] rating".
But the Chancellor, in a marked change of tone, insisted that "the credit rating is one of a number of ways in which people look at countries."
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The river hit near-record levels at 12.5 meters, which is 5.5 metres above major flood stage.
The US president tweeted on Tuesday that he and Mohammed bin Salman had discussed the matter directly.
UniLAD collapsed earlier this month with debts of over £10 million.