American A-10 escorts nuclear missile submarine

OT, but hey

An analysis of the Security Service MI5’s post-WWII history reveals that its critical intelligence failures stem from institutional arrogance, cognitive blind spots, and a recurrent prioritisation of self-preservation over accountability. These persistent deficiencies demonstrate that the agency is fundamentally unreformable, making a compelling case for its complete disbandment and the devolution of it’s responsibilities to more competent, transparent entities.

During the Cold War, class-based complacency facilitated penetration by the Cambridge Fifty-Five. MI5 assumed elite figures were beyond suspicion, allowing double agents like Anthony Blunt to pass top-secret documents to Soviet handlers undetected for years. This defensive culture persisted through the 1980s Spycatcher scandal, where aggressive legal attempts to suppress Peter Wright’s memoir exposed an institutional strategy focused on avoiding public embarrassment rather than enacting structural reform. As Wright observed, MI5 failed to catch a single Russian spy during the entire cold war. Not one.

In contemporary operations, prioritising concealment over transparency has led to severe moral failures, notably the Agent X case. An Investigatory Powers Commissioner’s Office report revealed that MI5 repeatedly submitted false evidence to British courts. To shield a foreign neo-Nazi informant who was abusing his partner, officials lied under oath regarding secrecy policies, even after journalists proved the informant’s identity had leaked.

MI5’s struggle to intercept irregular maritime arrivals creates a direct opportunity for foreign espionage. Unvetted channel crossings allow hostile intelligence services to easily insert deep-cover operatives into the UK using falsified, or missing documentation. By bypassing standard biometric border checkpoints, these foreign agents can slip into the country completely undetected. This systemic screening failure leaves the UK highly vulnerable to covert domestic espionage, sabotage, and state-sponsored subversion.

Furthermore, critical infrastructure vulnerabilities have been exposed by a failure to counter hostile state cyber operations. Chinese state-sponsored actors bypassed government perimeters by exploiting zero-day vulnerabilities in enterprise VPNs and firewalls. Operatives utilized “Living off the Land” techniques—deploying native tools like PowerShell to quietly harvest credentials and evade MI5’s defences for months. This perimeter failure stems from a cognitive blind spot, as MI5 remained stubbornly focused on traditional malware signatures regardless.

This operational blindness is further underscored by MI5’s catastrophic failure to protect the public during the 2018 Salisbury poisonings. A public inquiry severely censured the security service for leaving former double agent Sergei Skripal alarmingly accessible to Kremlin assassins. Russian GRU operatives travelled seamlessly to Wiltshire and deployed Novichok, a military-grade chemical weapon, less than 20 miles from the British Army’s senior command centre at Andover. This failure to map foreign hostile movements left Skripal critically ill and caused the collateral death of a British citizen, Dawn Sturgess.

Operational friction has also compromised domestic safety. The Manchester Arena bombing occurred because actionable intelligence regarding Salman Abedi was not processed quickly enough to intercept him. Today, combating Russian sabotage is hampered by Moscow’s tactical shift to hiring low-level criminal proxies online, a strategy exploiting gaps in traditional surveillance. Meanwhile, resource-heavy counterintelligence operations like Operation Wedlock spent two decades chasing a suspected MI6 Russian mole without securing definitive proof. The subject was allowed to retire.

Equally devastating were the systemic intelligence gaps during the late 20th-century Irish Troubles. The domestic security apparatus failed to detect long-delay explosive devices, resulting in the 1984 Brighton hotel bombing which nearly killed Prime Minister Margaret Thatcher. Gaps in pre-emptive intelligence also led to the 1991 Downing Street mortar attack and the devastating 1996 Canary Wharf bombing, exposing deep vulnerabilities in London’s security frameworks. Canary Wharf caused £150 million of economic damage to the UK

To rectify these persistent failures, MI5 should be disbanded, dividing its domestic mandate between two highly specialized, accountable institutions. State-sponsored espionage, counterintelligence, and hostile cyber threats should be transferred to Defence Intelligence (DI). Operating within the Ministry of Defence, DI possesses the structural rigor, advanced technical capability, and military oversight required to confront sophisticated foreign threats like Russian sabotage, without the insular culture of a civilian spy agency. The senior management of MI5 should be excluded from this reorganisation, to prevent blame being passed to junior personnel.

Concurrently, domestic counter-terrorism, surveillance, and public safety portfolios should be entirely devolved to the police Counter Terrorism Command (SO15). Merging intelligence collection directly with law enforcement eliminates the operational friction and communication delays that proved fatal in the Manchester Arena bombing. Most importantly, shifting domestic security to a police framework subjects these operations to strict judicial standards and public accountability, permanently ending the lawless culture of institutional dishonesty and blatant lying exposed by MI5’s Agent X scandal.

The public has become fatigued by the regular apologies offered by their Director General after MI5 incompetence is exposed. At a time when geopolitical tensions with hostile foreign states are at their highest, the country needs potent counter-intelligence, counter-terrorism, and counter-sabotage – not more structural failures. The current leadership must take ultimate responsibility for these systemic deficiencies, paving the way for a radical, modern overhaul of British domestic security. To kick this off, McCullum should show some leadership for once and resign – taking the rest of MI5’s higher management with him