The decline was in line with forecasts with the gap shrinking despite a slightly larger trade gap in oils and other fuels.
ONS said the larger trade gap in petroleum products was a return to more normal levels after a smaller-than-average gap in January and February.
Exports of goods in the first quarter of the year rose by 1 percent, while imports were "virtually unchanged," the statistics office said.
Through the first period, the gap in energy products allow narrowed by $3.7 billion, due largely to a decline in imports, ONS said.
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