Taxpayers have still not been told if they were scammed by corrupt builders working on two of Harrow Council's biggest construction contracts.
The report into supposed fraudulent invoices and kickbacks involving more than one firm working for Kier, the national building company that maintains and upgrades the borough's social housing was due before Christmas.
The investigation was launched jointly by the authority and Kier in July last year and was only made public when a whistleblower contacted the Observer in October.
Residents and councillors alike are still in the dark about whether any of the allegations have been proven and if they have, who was involved and how much money the council lost.
At least three supposed publication dates have come and gone since December.
Labour councillor Bob Currie said: "I haven't heard a thing so they must have something to hide.
"There's no-one who seems to be willing to say: get your finger and get on with it.
"It's a sham and I hope no-one is trying to block the report.
"The whole borough should know. Any time a complaint comes up it seems to have Kier involved."
He added: "The whistleblowing policy has been thrown out the window. It shouldn't take six months to investigate."
David Ashton, leader of the council, has previously said: "Harrow Council expects the highest standards of probity from its commercial partners. If any money is found to be owed as a result of these allegations, the authority will look to recoup those losses."
A Harrow Council spokesman said: "We hope the report will be published shortly. There are some some last minute legal revisions."
A spokeswoman for Kier, whose Harrow headquarters are in Barrett Way, said the firm did not have any new comment to make.
It is unclear whether Harrow police has been called in to investigate criminal allegations.
