The UK economy grew by more than initially thought in the second quarter of 2010, boosted by a strong performance by the construction sector.
The economy grew by 1.2% in the quarter, the Office for National Statistics ONS said, revising up its initial estimate of 1.1% growth.
That was the fastest rate of quarterly expansion recorded since the first three months of 2001.
But one area that suffered a big fall was air transport, which fell 11%.
The first estimate of GDP is usually revised twice at monthly intervals.
Positive effectThe ONS said construction output grew by 8.5% in the second quarter, up from a previous estimate of 6.6%.
Aileen Simkins from the ONS said the overall effect in the quarter had been "very positive".
She said the fall in air transport reflected the effect in April of the ash cloud as well as the British Airways strike.
A spokesman for the Treasury said: "While the government is cautiously optimistic about the path for the economy, the job is not yet done.
"The priority remains to implement the Budget policies which support economic rebalancing and help ensure the sustained growth that the Office for Budget Responsibility forecast this year and next."
Eyes on the roadGrowth in the key services sector, which accounts for about three-quarters of the UK economy, was revised down to 0.7%.
Within the sector, business services and finance posted a rise of 1.5%, revised up from 1.3%.
But business leaders warned that the strong pace of growth would not last.
"Todays figures are obviously good news but we shouldnt get carried away," Graeme Leach, chief economist at the Institute of Directors, said.
"Instead of looking in the rear view mirror at what has passed it would be wiser for us to keep our eyes on the road ahead. We dont expect this level of growth to be sustained through the second half of 2010.
"But whether or not this slide will turn into a quarterly decline or a double dip recession remains highly uncertain."