Labour leader Ed Miliband recorded a video to explain why he will be voting to legalise gay marriage. He said:
"I don't think the person you love should determine the rights you have, that is why I will be voting for equal marriage, along with the rest of the shadow cabinet"
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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.