The U.K. economy grew by 0.3 percent in the three months to June compared to the previous quarter, which was in line with expectations.
However, the Office for National Statistics noted a "notable slowdown" in the first half of 2017. The government agency said construction and manufacturing dragged down the country's economic performance, after registering two consecutive quarters of growth.
Samuel Tombs, chief U.K. economist at Pantheon Macroeconomics, said the data confirm that the country's economy was indeed slowing.
"The preliminary estimate of GDP (gross domestic product) confirms that the economy has little momentum because consumers are enduring falling real wages and businesses are holding back from spending due to Brexit risk," he said in a statement.
The slight uptick in the British economy, however, was mainly driven by services and also by film production and distribution, the preliminary data showed Wednesday.