Labour has refused to reopen its inquiry into the Falkirk vote-rigging row amid claims evidence from a key witness was withdrawn without her consent.
A party spokesman said Lorraine Kane had been asked about quotes in the Daily Mail suggesting she had not intended to retract her complaint about alleged irregularities in the candidate selection process.
However, she confirmed she stood by the sworn statement given to the party’s probe in September, according to the spokesman.
“It was that affidavit which was part of the reason that led the Labour Party to conclude there was insufficient evidence to proceed with our inquiry,” he said.
“Therefore we have not seen any new evidence to justify further action.”
It came as former chancellor Alistair Darling and Scottish Labour leader Johann Lamont suggested that the issues around the contest in the constituency should be looked at again.
“Something has gone very wrong in Falkirk. There needs to be a very thorough investigation,” Mr Darling said.
“I understand the police are looking at matters now.
“If they proceed, then that is what’ll happen but if they don’t there needs to be a full inquiry and I am quite clear that the results have to be published because that is the only way in which people will be satisfied that justice is done and been seen to be done.”
Ms Lamont said: “I think we certainly need to look at that because obviously there is a concern if the investigation wasn’t entirely complete. Again, I say these matters are ongoing. We know that some complaints have been given to the police.
“In this process what we want to do is get beyond the point where people are claiming and counter-claiming and get to the point where again individual Labour party members are treated with respect and, more critically, we fight to get a Labour representative in Falkirk who will stand up properly for the people of Falkirk.”
Party leader Ed Miliband has come under pressure to publish a report into the allegations in light of claims the union “manipulated” the process.
The Sunday Times said it had seen emails suggesting the retraction letter of witnesses was written by Unite officials and approved by one of the figures at the heart of the dispute, Falkirk constituency party chairman Stevie Deans, who was also the union’s convenor at the Grangemouth petrochemical plant until he resigned last week.
Lorraine and Michael Kane were among those who claimed that they were signed up as members without consent.