A classified government dossier has revealed that more than £28 billion of British taxpayer money ended up in the hands of terrorists, hostile foreign powers and organised criminal networks over a six-year period, in what experts are describing as one of the most alarming public spending failures of recent times.

The internal Cabinet Office assessment, covering the years between 2015 and 2021, paints a deeply troubling picture of how weaknesses across government departments, grant programmes and emergency funding schemes allowed vast sums of public money to be diverted away from their intended purpose.

Perhaps most strikingly, the report suggests that the losses were not confined to fraudsters exploiting loopholes for personal gain. Instead, substantial amounts of public money are believed to have flowed, directly or indirectly, to organisations and individuals considered threats to Britain’s national security.

The findings raise uncomfortable questions about whether successive governments fully appreciated the growing overlap between economic security and national security.

According to the dossier, foreign aid programmes, Covid support schemes, research grants and welfare payments were all vulnerable to exploitation.

Among the cases highlighted are pandemic relief loans allegedly reaching Islamic State-linked individuals in Syria, grants awarded to companies with connections to the Russian state and research funding that ultimately benefited firms linked to China’s military-industrial complex.

Security sources cited in the report suggest some of the money is now effectively unrecoverable.

In several cases, officials were unable to trace the final destination of funds after they passed through multiple intermediaries or overseas entities.

One example reportedly involved a British technology company working on sensitive dual-use systems with defence applications. After receiving significant government support, a stake in the company was subsequently acquired by a Kremlin-linked entity.

Critics argue that such cases expose a dangerous gap between industrial policy and national security oversight.

The revelations are likely to intensify scrutiny of Britain’s grant-awarding processes, particularly at a time when geopolitical competition with Russia and China has become a central concern for policymakers.

The report also details how organised crime groups exploited public spending programmes on an industrial scale.

People-smuggling gangs were allegedly able to access housing benefits and welfare payments through fraudulent claims, while criminal networks operating across Europe systematically targeted British funding streams.

Security officials reportedly identified instances where hostile states provided indirect support to organised crime groups involved in exploiting UK public finances.

For many observers, the most concerning aspect is not simply the scale of the losses but the apparent lack of accountability.

Despite billions of pounds being misdirected, few individuals appear to have faced significant consequences.

Sources familiar with the dossier suggested the report was commissioned in 2023 but never released publicly.

Its existence remained largely unknown until details emerged through media investigations.

Critics have questioned why findings of such magnitude were not placed in the public domain earlier, particularly given the implications for taxpayer confidence and national security.

Rebecca Harding, from the Centre for Economic Security, argued the report demonstrates how economic threats can no longer be viewed separately from traditional security concerns.

She warned that hostile actors increasingly use commercial systems, financial networks and public funding mechanisms as tools of economic warfare.

Tom Keatinge, of the defence and security think tank Royal United Services Institute, said the findings highlighted how vulnerable public spending programmes can become when proper safeguards are absent.

The criticism is particularly acute in relation to pandemic-era lending schemes.

Separate investigations have already estimated that billions of pounds were lost to fraud and error during the Covid response, prompting repeated calls for stronger oversight and recovery efforts.

The latest revelations suggest the consequences may extend far beyond financial waste.

For security experts, the dossier illustrates a broader failure to recognise that public money can become a strategic asset for hostile actors if controls are inadequate.

The report’s findings are also likely to fuel a wider debate about the balance between speed and scrutiny in government spending.

Many of the programmes examined were introduced during periods of crisis, when ministers prioritised rapid deployment of funds.

While supporters argue that emergency action was necessary, critics contend that insufficient checks created opportunities for abuse on a vast scale.

The Government insists it has strengthened anti-fraud measures and recovered billions through enhanced enforcement activity.

Ministers point to specialist investigative teams, improved data analysis and more aggressive efforts to pursue fraudsters.

Yet national security officials remain concerned that responsibility for assessing security risks across grant programmes remains fragmented.

The result, they warn, is a system in which billions of pounds can still move through public programmes without consistent scrutiny of who ultimately benefits.

For taxpayers, the dossier presents a stark and troubling conclusion: money intended to support economic development, public services and national recovery may instead have helped enrich criminal gangs, strengthen hostile states and fund extremist networks.

If accurate, the findings represent not merely a financial scandal, but a profound failure of government oversight with consequences that extend far beyond the balance sheet.