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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A police officer in today's London Pride parade surprised his partner by proposing in the middle of the parade.
Government minister Justine Greening has apparently opened up about her sexuality, as thousands took part in the London Pride parade.
Record crowds are at this year's Pride in London parade as people show their support for the LGBT community after the Orlando shooting