Nick Clegg and Nigel Farage have clashed over British foreign policy regarding Ukraine, Russia and Syria.
Mr Farage also attempted to clarify comments he made about Russian president Vladimir Putin, saying he admired him "as an operator" but not as a man.
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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.