No-one is to face charges after the 16-month cash-for-honours police inquiry, the BBC understands.
Four people were arrested, including two of Tony Blair's aides, during the £1m probe into whether honours were given in exchange for party donations.
Prime Minister Gordon Brown said it was right that police had investigated the "very serious allegations".
But he said he hoped the official announcement expected later would bring to an end "months of speculation".
Speaking to reporters in Paris, where he is discussing Darfur with French President Nicolas Sarkozy, Mr Brown said he wanted to "move ahead" with reform of political funding.
Former prime minister Tony Blair and Labour fundraiser Lord Levy are expected to make statements later.
BBC political editor Nick Robinson says Scotland Yard is preparing to make a public defence of its officers.
Serious allegations
Assistant Commissioner John Yates of the Metropolitan Police - who led the inquiry - has said from the outset his officers were simply doing their jobs by investigating serious allegations.
He was backed by Chris Fox, a former president of the Association of Chief Police Officers, who told BBC Radio 4's Today programme: "I'm confident that John Yates and his team will have done everything they possibly could to get to the bottom of the allegations.
"When someone makes an allegation like that the police service have to take it seriously."
The Crown Prosecution Service is set to announce its decision on Friday but has so far refused to comment.
But Downing Street adviser John McTernan, who was among those questioned, told the BBC: "It's a massive relief for everybody involved in this that at last a line can be drawn under it."
Sources : http://news.bbc.co.uk/
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