The survey's upbeat findings are further good news for Chancellor of the Exchequer George Osborne, who was criticized by the International Monetary Fund (IMF) for his austerity policies last year, which it claimed would impede the U.K's ability to grow its way out of stagnation.
Read MoreUK food banks report 'shocking' rise in demand
However, several positive indicators on the U.K. economy have subsequently come out, and the IMF has upgraded its growth outlook for the country twice this year already.
Earlier this month, IMF Chief Economist Olivier Blanchard said he had "clearly under-forecast" U.K. growth.
Read MoreIMF upgrades its UK growth forecasts again
"It is fair to say our forecast was too pessimistic, and indeed growth has been much stronger than we had forecast," Blanchard told journalists.
Also on Wednesday, official statistics showed public net borrowing—the gap between what the government spends and raises in revenue—fell to £107.7 billion ($181.0 billion) in the financial year ending March 2014. This was better than the £107.8 billion forecast by the Office for Budget Responsibility.
In the 2012/13 financial year, government borrowing was £7.5 billion higher at £115.1 billion.