Asked whether he'd publish a full list of his dinners and meetings, Labour leader Ed Miliband said, "I'm very happy to be open and transparent about what we're doing."
"I think the stain on the character of the Government needs to be dealt with and I think only a full independent inquiry, done by the independent adviser on ministerial interests, will do," he added.
Labour has raced into a poll lead as the Tories deal with fall-out from the Budget and the cash-for-access controversy, a survey shows.
The Tories have released a list of party donors who attended a lunch with the PM, with Labour calling for an independent inquiry.
A look at the Conservative party donations and who paid them