The report was carried out by the Centre for Economic and Business Research for business services firm BDO LLP, and canvassed the situations and expectations of 11,000 respondents.
The company's BDO Output Index, which measures business confidence, now stands at 96.7, with any reading above 95 indicating growth.
May's reading was at the highest level for a year, and also much higher than April 2012's reading, when the index stood at 95.8.
Commenting on the figures, Peter Hemington, a partner at BDO LLP, said the major worry for British businesses at the moment is the ongoing eurozone issue.
"The biggest issue for UK businesses at the moment is that the strength of the pound against the euro has made UK exports much more expensive," he explained.
Mr Hemington added that the coalition should consider boosting growth by spending on infrastructure and taking advantage of the low cost of government borrowing.
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Posted by John Oak and Wayne Bly
Source: The Sales Director News