In Britain, the service sector grew 0.6 percent in the second quarter, construction grew 0.9 percent and agriculture increased 1.1 percent. Production, including manufacturing, grew 0.6 percent, the Office for National Statistics said.

“Firms are feeling upbeat and are capable of expanding,” said John Longworth, director general of the British Chambers of Commerce. “More and more are adopting a ‘have a go’ attitude when it comes to exporting, which is really encouraging, as this will go a long way to driving growth further still.”

The BT Group, the telecommunications company, on Thursday reported fiscal first-quarter earnings that beat some analysts’ forecasts and said the outlook for its business was improving slightly. EasyJet, the low-cost airline, said on Wednesday that its sales rose in the second quarter as it added capacity in Europe.

The economic revival in Britain is also accompanied by a rise in the price of residential property, according to the mortgage provider Halifax, a unit of the Lloyds Banking Group. The value of homes rose 0.6 percent in June to the highest level in almost three years, helped by government measures that help potential home buyers make down payments.

But some economists said Britain’s recovery could start to lose momentum again in the second half. Banks remain reluctant to lend, especially to small and medium-size companies; real wages have barely moved; and inflation continues to exceed the Bank of England’s 2 percent target. A recovery is also closely linked to the strength of the economies of Continental Europe, Britain’s largest export market, and Asia.