Acting Director of BBC television Roger Mosey has posted his tribute to Sir Patrick Moore on Twitter:
Patrick Moore was one of the great educators of modern television. He inspired people to study astronomy. We and our audiences will miss him
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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.