Barnet Council has delayed releasing details of Councillor expenses until one day after the local elections finish.
The details were requested by a local blogger almost a year ago, but their release has been repeatedly pushed back by officers.
Freedom of information requests should ordinarily be responded to within twenty working days.
Only a fraction of the information requested has so far been disclosed.
In one leaked email, the borough's Conservative Mayor Brian Coleman complains that the requests were an "attempt to make trouble" and not "a sensible use of Council resources."
Meanwhile his own "use of resources" have been withheld from constituents.
Coleman, described as an "expenses farmer" in the latest edition of Private Eye, is a notorious abuser of the expenses system at City Hall.
In just one year he claimed £10,000 in taxi bills and has consistently fought against disclosure.
Last year he was the only London Asembly member not release their expenses, saying that only the "mad, sad and bad" would want to see them.
He reportedly only gave in after a showdown with Boris Johnson.
Details of all Barnet Council expenses will now be released on the 7th May. Just one day after voting in the local elections closes.