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".
The newly-appointed boss of betting firm Ladbrokes has distanced himself from a letter supporting the Tories which was signed by his predecessor.
Jim Mullen said it was not for him or the business to "tell people how to vote", adding: "I want to make it clear that our business is to take bets on the General Election, not to tell people how to vote."
Mr Mullen is the second senior executive to distance themselves from the letter, after the head of AstraZeneca withdrew his name earlier today.
In a letter to the Telegraph, Mullen said: "There are many shades of political opinion in our workforce of 15,000 never mind ex-employees or our customer base of millions of people.
"My vote is worth the same as theirs and their choice of vote is their business. So I won't be signing any letters in this, or any other General Election, that seeks to tell people how to vote."
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.