MINISTERS were accused of a “wholly inadequate” response to the threat of cyber warfare from Russia last night in a damning verdict by a top parliamentary committee.

The influential Joint Committee on National Security Strategy (JCNSS) said the Government had failed to act with “a meaningful sense of purpose or urgency” to shut down the threat of cyber attacks on Britain’s critical national infrastructure (CNI).

Failure to take serious enough action had put Britain in danger of “growing and evolving” threats to infrastructure such as our energy grid and NHS from state actors such as Russia but also an increasing number of organised crime groups.

In a rebuke to the Prime Minister, the report concluded that “identifiable political leadership is lacking” on cyber security.

The committee called on Theresa May to appoint a single cyber security minister in the Cabinet Office to take charge of the efforts to build national resilience.

The alarming warning comes after Britain’s cyber bosses warned that a major online attack on our CNI is only a matter of “when, not if”.

The JCNSS said that while the Government had acknowledged this as a “top tier” threat to national security that has potentially “devastating” consequences, its actions had so far failed to match the level of risk.

The committee also called on the Government to “prioritise” continued information-sharing and collaboration on cyber with the EU in the Brexit talks.

The JCNSS committee, which is made up of senior MPs and peers to monitor the Government’s National Security Strategy, said: “While we applaud the aspiration, it appears the Government is not delivering on it with a meaningful sense of purpose or urgency.

“Identifiable political leadership is lacking.

“There is little evidence to suggest a ‘controlling mind’ at the centre of government, driving change consistently across the many departments and CNI sectors involved.

“We are concerned that the current complex arrangements for ministerial responsibility mean that day-to-day oversight of cross-government efforts is, in reality, led by officials, with ministers only occasionally ‘checking in’.

“This is wholly inadequate to the scale of the task facing the Government, and inappropriate in view of the Government’s own assessment that major cyber attacks are a top-tier national security threat.”

The committee welcomed the establishment of the National Cyber Security Centre as the national technical authority but expressed concerns that expectations of what it could achieve were “outstripping the resources put at its disposal”.

It noted that the a recent tightening of the regulatory regime “was not the Government’s own initiative but instead flows from our acceptance of EU-wide regulations”.

Ministers needed to do more, it said, to change the culture of CNI operators in the private sector to ensure the cyber threat was addressed at board level with an understanding that it must be “proactively managed”.

“It appears that the Government is reluctant to move more forcefully and, by default, continues to rely on market forces to improve operators’ cyber resilience, despite recognising the previous failure of this approach,” it said.

The committee chair, former foreign secretary Margaret Beckett, said: “We are struck by the absence of political leadership at the centre of government in responding to this top-tier national security threat.

“Too often in our past the UK has been ill-prepared to deal with emerging risks.

“The Government should be open about our vulnerability and rally support for measures which match the gravity of the threat to our critical national infrastructure.”