Labour leader Ed Miliband has admitted that he sought the sacking of Gordon Brown's former aide Damian McBride, and that he raised his concerns at the time to Mr Brown.
He told the BBC's Andrew Marr Show that he was concerned about "indications that he [McBride] was briefing against colleagues".
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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.