Gross domestic product (GDP) grew 0.6 per cent, the Office for National Statistics (ONS) said in a second estimate for April-June, which included the shock EU exit referendum towards the end.
That was unchanged from the initial estimate, and followed 0.4-percent expansion in the first quarter.
"The reporting period for this release covers quarter 2 and therefore includes data for a short period after the EU referendum," the ONS said.
"There is very little anecdotal evidence at present to suggest that the referendum has had an impact on GDP in Quarter 2 2016," the ONS added in a statement.
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Britons had voted on June 23 to leave the European Union in a surprise vote that sent markets tumbling and the pound slumping in its initial aftermath.
"The vote for Brexit occurred too late in the (second) quarter to have a significant impact on growth," said IHS Global Insight economist Howard Archer.
However, he also warned it would be a "considerable time" before the economy would expand by "anything like 0.6 percent" quarter-on-quarter.
"We suspect that the UK's vote to leave the European Union in the 23 June referendum will significantly weigh down on UK economic activity for a prolonged period, primarily due to prolonged uncertainty over the outlook affecting business investment and employment," Archer said.