Education Secretary Michael Gove has denied being at war with Theresa May, saying the Home Secretary is doing a "fantastic job".
Asked if she was too soft on Islamic fundamentalism, Mr Gove told reporters: "No absolutely not, she's doing a very fine job."
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Temperatures will reach around 28 Celsius (82F) at their highest.
A minute's silence will be observed at 11am on Thursday in remembrance of those who lost their lives in the Manchester Arena attack.
New research has found those who consumed two cups had a 35% reduced risk, and for those who drank five cups, the risk halved.