The finance chiefs have also regained their faith in banks, with 80 percent saying bank credit was an attractive source of funding.
"Large corporates have good access to capital and CFOs are more positive about financing their business with equity and bonds than at any time in the last six years," Stewart said.
"But in a sign that banks are lending once again CFOs rate bank lending as the most attractive form of finance for their business for the first time since 2008."
Bank of England (BoE) Governor Mark Carney also has the backing of corporate Britain. Just under half of the CFOs surveyed said the leadership of the Canadian-born BoE chief has made them more positive about the U.K.'s economic outlook.
(Read more: UK economy goes from 'zero to hero' but don't expect giveaway)
However, the majority of CFOs doubt whether the BoE can meet its 2 percent inflation target. Consumer price inflation slipped to a four-year low of 2.1 percent in November, but 53 percent of respondents said they thought inflation would rise above 2.5 percent in two years' time.
Interest rates could rise by the middle of 2015, according to 59 percent of those surveyed, while just under a quarter said a rate hike could be seen this year. Carney had previously said the bank would not consider raising the main interest rate from its current 0.5 percent until the jobless rate fell to 7 percent – but with unemployment sliding faster than expected, some expect the central bank to hike rates sooner than initially thought.