The Ding Dong song from the Wizard of Oz was at number three in the UK charts this morning but could still take top spot.
The record has sold about 12,000 fewer copies than the current chart-topper Need U (100%) by Duke Dumont, with the final sales coming in at midnight tomorrow.
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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.