U.K. economic growth slowed more sharply than expected in the first three months of the year, according to a more detailed estimate from the country's statistics office, as consumers trimmed discretionary spending amid searing inflation and increased political uncertainty linked to the country's decision to leave the European Union last June.

The U.K. economy, the world's fifth-largest, grew at a 0.2% clip in the three months ending in March, the Office for National Statistics said in its Thursday, down from the so-called flash estimate of 0.3% published on April 28 and the 0.7% pace recorded in the final three months of last year. The ONS said the country's service sector led the slowdown with growth of 0.3% compared to 0.8% in the final three months of last year.

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