The OECD's gloomy forecast for UK growth in the three months to the end of March comes after official figures revealed the economy contracted by 0.3% in the final quarter of 2011.
This was worse than the previous estimate of a 0.2% fall.
The OECD also warned the recovery for the world's biggest economies would be fragile, with the outlook for Europe "very weak".
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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.