POLITICIANS probing a £1 billion anti-war fund are “working in the dark” because of government secrecy, a parliamentary report says.

Spending and strategy details for the Conflict, Stability and Security Fund (CSSF), set up under David Cameron, were kept from a parliamentary inquiry by ministers on the grounds of security concerns.

The government has now said it will give private briefings on its work to the Joint Committee on the National Security Strategy (JCNSS).

But MPs and peers say they are “sceptical” about the move and warned they “cannot work in the dark” when assessing how taxpayers’ cash is being spent.

In the last financial year, £484 million of the body’s total £1.127bn budget went to official development assistance.

No single minister is accountable for the CSSF and, in an evidence session last month, Home Secretary Amber Rudd said it is backing almost 100 initiatives in 40 countries.

Rudd said this includes Syria’s White Helmets, but declined to give any further details.

Meanwhile, the government has refused to reveal the names of the countries in which the money is spent or reveal how the fund works or even which projects it supports.

Dame Margaret Beckett, who chairs the committee of MPs and Lords, said: “During our inquiry, the government failed to provide the committee with sufficient evidence to judge whether the fund was reaching its potential.

“We cannot work in the dark.

“Without access to the National Security Council strategies for the fund, information about all the programmes and projects it has funded and a comprehensive breakdown of expenditure, we could not be expected to provide parliamentary accountability for taxpayers’ money spent via the conflict, stability and security fund.

“Such information could be provided in private to the committee.

“The government does seem persuaded of the need for more transparency and has given assurances to publish information where possible. However, this conversation will continue into the next parliament.

“JCNSS will not be rubber-stamping any government responses until the committee is satisfied we can meet our responsibilities to the public.”

The government says it will release further details at the end of June, when the CSSF reaches the end of its second year of operation.

This includes breakdowns of expenditure, plus information about the countries and projects the fund works with.

However, a statement noted: “While we are committed to transparency, there will be some details that cannot be published due to security sensitivities, the impact on international relations and our duty of care to our implementers.”

On the work of the body, it continued: “The UK continues to play a leading role globally. The UK is helping to tackle insecurity and instability around the world.

“The CSSF plays an important role in supporting this wider work as directed by the National Security Council.”