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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The band announced at a free concert on Friday that they would take over the event's Pyramid stage on Saturday June 25.
The victims were collecting permits and escorts a day after their home town was liberated from the extremists.