The ONS told CNBC on Wednesday that it had seen no anecdotal evidence that the 'Brexit' debate had had any impact on the data, however.
Uncertainty over the referendum did not bode well for second-quarter growth, either, analysts warned.
"Uncertainty about the economic outlook appears to have intensified ahead of the EU referendum, and the danger is that this will cause a lull in businesses decision making as the June vote draws closer, which will in turn reduce business spending, investment and hiring in the second quarter," Chris Williamson, chief economist at Markit, said in a note following the GDP data.
"Surveys were already showing business optimism about the year ahead to have fallen in the first quarter, dropping to levels commensurate with a near-stalling of economic growth as 'Brexit' worries exacerbate existing concerns about the fragility of economic growth at home and abroad," he added.
A "Brexit" has also been blamed for the latest U.K. employment figures which offered a mixed picture on the health of the economy. Data published by the Office for National Statistics (ONS) last week showed that although the unemployment rate held steady at 5.1 percent in the three months to February, the actual number of unemployed rose by 21,000 in the three months to February to 1.7 million people.