Goldman Sachs Group Inc. has agreed to a fine of nearly 20 million pounds ($30.7 million) as part of an investigation by the U.K.'s Financial Services Authority that began shortly after U.S. regulators accused the firm in April of fraud.

People familiar with the matter said Goldman is expected to concede that it made an error in its registration of trader Fabrice Tourre, a London-based employee of the firm who was sued by the Securities and Exchange Commission for allegedly cheating investors in a collateralized debt obligation called Abacus 2007-AC1.

The expected fine would be one of the biggest ever by the U.K. regulatory agency.

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