More than 100 business leaders have declared their support for the Conservatives, warning a "change of course" after the general election would "put the recovery at risk".
Senior executives from leading British companies - including five who have previously backed Labour - signed an open letter praising the Conservative's economic policies.
Labour dismissed the letter as "nothing new".
A business leader who signed an open letter backing the Conservatives has withdrawn his name.
Pascal Soriot, chief executive of pharmaceutical giant AstraZeneca, was one of 103 executives to sign the letter warning a "change in course" would risk Britain's recovery.
Mr Soriot, however, said he did not want his name used in the context of the letter and did not wish to endorse any political party ahead of the May 7 vote.
Mr Soriot agreed to add his name after being shown the content of the letter by a senior party figure, according to reports.
"Neither I nor AstraZeneca endorse any political party and, while I support such policies, my name should not be used in the context of the letter," he said in a statement.
More than 100 people claiming to represent working people across Britain have signed a letter backing Labour in the general election.
Tories take campaign to the factories of three businesses who publicly endorsed their economic plans.
Read the letter carefully, don't worry, it's short. Note that while it praises the Conservative-led government it does not mention Labour.