Britain’s flagship defence agreement with the United States and Australia is facing mounting strain from weak political commitment, funding delays and an overstretched Royal Navy submarine fleet, according to a sharply critical parliamentary report.
The Commons Defence Committee warned that “shortcomings and failures threaten to prevent the promise becoming a reality” for the Aukus pact, which was launched in 2021 to deliver nuclear-powered submarines to Australia and deepen advanced military technology cooperation between the three allies.
MPs said senior political engagement had “faded”, with the programme suffering not from technical barriers but from inadequate prioritisation and underinvestment at a critical stage of its development.
The committee singled out investment delays at Barrow-in-Furness — home to Britain’s sole submarine construction facility — warning that regeneration work at the site was “too big to fail” given its central role in delivering the submarine programme.
Committee chairman Tan Dhesi urged greater involvement from the Prime Minister, warning that “political drift” risked undermining one of the UK’s most strategically significant defence commitments.
Aukus can’t be seen as just another defence programme – if it is to stay on track, then leadership must come from the very top,” Dhesi said.
He cautioned that even small delays could add up to “potentially severe consequences” for national security and Britain’s defence relationships with Washington and Canberra.
The report also raised concerns about the Royal Navy’s ability to meet its obligations under Aukus, highlighting critically low submarine availability, which is placing intense pressure on operational capacity.
Earlier this year, HMS Anson, an Astute-class submarine, undertook a deployment to Australia under the agreement, but MPs were told the visit was curtailed following the outbreak of conflict in Iran, leaving no spare vessels available to respond.
“Submarine availability is critically low,” Mr Dhesi said, warning that without urgent upgrades at HMNB Devonport and HMNB Clyde, the Government risked failing to meet core commitments under the pact.
He warned: “Without urgent infrastructure improvements at HMNB Devonport and HMNB Clyde, the Government risks finding itself unable to meet its obligations under Aukus.
The committee said routine deployments required under Aukus risk leaving the Navy with “no breathing space” during emergencies, intensifying calls for accelerated investment in infrastructure at Plymouth and Faslane.
Beyond the submarine programme, MPs also expressed concern over the second pillar of Aukus, which focuses on joint development of advanced military technologies.
While acknowledging its potential to be “transformative”, the report concluded that progress had been slow and warned the initiative had “so far failed to deliver on its promise”.
Following a delegation visit to Washington, MPs said they were left in “no doubt that time was running out” for the programme to maintain credibility.
The committee recommended pausing any expansion of partner nations under pillar two, instead urging ministers to focus on securing “swift agreement” with the US and Australia on practical initiatives that deliver immediate operational benefits.
The findings add to growing scrutiny of Britain’s long-term defence commitments at a time of heightened global instability, with MPs warning that failure to act decisively risks undermining one of the UK’s most strategically important military partnerships.
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