The Government has no way of knowing how much the Sue Gray Partygate inquiry will cost, officials have said.
The Cabinet Office was accused of a "cover up" last month, when they refused to release costings for the probe.
Now, after a complaint from campaign group Unlock Democracy, officials have revealed the Cabinet Office "does not have a central tool in place to monitor the level of resource and/or cost of projects that are being funded from the department’s core administration budget."
