British Chancellor of the Exchequer Alistair Darling plans to flesh out a proposal for overhauling the International Monetary Fund in a speech today in Washington, calling for it to focus more on the potential for global financial problems.

Mr. Darling also wants the fund to be more accountable to the 185 countries it represents, and combine with the Financial Stability Forum to create an early-warning system for the world's financial markets, according to a British Treasury official.