The Organisation for Economic Cooperation and Development (OECD) warned on Wednesday that ther UK's economic growth rate will slow in the next two years as a result of a drop of about 10% in property prices. The organisation said in its half-yearly outlook that the downturn in the real estate sector will make the country's economy more vulnerable to the global credit crisis, reducing economic growth to 1.8% this year and around 1.4% in 2009.