Britain could deal a damaging blow to the fragile global economy if it votes to leave the European Union in June, the IMF said on Tuesday in the sharpest warning yet from a global body about the risks associated with Brexit.<br />In a half-yearly assessment of the world economy, the International Monetary Fund listed the June 23 referendum as a key risk alongside instability in China and other emerging markets, volatile share prices and a loss of long-term growth potential in advanced economies.<br />The Fund also cut its 2016 growth forecast for Britain to 1.9 percent from 2.2 percent, the sharpest downgrade for any major advanced economy other than Japan.