The Chancellor suggested the risk of economic shocks meant she could not guarantee there would be no further tax rises.
The UK Health Security Agency stressed there is no evidence at this stage to suggest the A(H5N1) virus will start spreading among humans.
Tens of thousands of people have been displaced, and both countries are preparing shelters and evacuation plans in anticipation of more heavy rain.
The Prime Minister acknowledged the possibility of a negotiated end to the Ukraine war at a speech in central London.