Mr Miliband has repeatedly attacked the Conservative Party for accepting large sums of money from the City, and, in particular, Mayfair hedge funds.
Indeed, it was a central charge of Mr Milibands response to George Osbornes Budget. He told the Commons that the stinking rich Tories had refused to act on hedge funds because they bankroll the Tory Party.
He cant act because they own him, lock, stock and barrel, he added.
The apparent reluctance of Labour to confirm Mr Taylors identity will fuel concerns about the transparency of the party around private donors.
Under a system set up in the wake of Chequers lobbying row, the Conservatives release the names of major donors who attend Leaders Club dinners with Mr Cameron every quarter.
The lists include details of whether they have occurred at Chequers, his grace-and-favour mansion.
Similar disclosures of meetings with the Labour leader, by contrast, are far less frequent, with the most recent available covering the year up to December 2013.