The U.K. economy grew by 0.6 percent in the second quarter of the year, quarter-on-quarter, according to the first official estimate out since the country's Brexit vote stunned global markets.
Analysts had expected second-quarter economic growth to come in at 0.4 percent, with activity seen strong in April and May and much weaker in June, around the time of the referendum.
Kallum Pickering, senior U.K. economist at Berenberg, told CNBC the data were "certainly a surprise on the upside."
"What strikes me the most is that the economy accelerated heading into the EU referendum," he said.
The U.K.'s Office for National Statistics (ONS), who produced the data, noted that the preliminary estimate used only half the information required for the final figure. The new figures include data from the three months ending June 30, with the referendum having taken place on June 23.