Damning report into UK's 'complacent' fast jets programme

Repeated delays to the UK's multibillion-pound F-35 fast jet programme, because of a lack of cash, has increased costs and harmed the plane's ability to fight, a report by MPs has said.

Exacerbating the problem, an "unacceptable" shortage of pilots and engineers is limiting how often the aircraft can fly, the Public Accounts Committee revealed. It also raised questions about a major announcement by Sir Keir Starmer in June that the UK would purchase a variant of the aircraft that is able to carry American nuclear weapons, saying there did not appear to be a timeframe for when this capability would be operational nor an estimate of the additional price tag.

The strong criticism will likely make uncomfortable reading for Air Chief Marshal Sir Richard Knighton, Britain's new military chief. He was previously the head of the Royal Air Force and before that the top military officer at the Ministry of Defence (MoD) in charge of capability.

The UK only has 37 out of a planned 138 F-35 jets in service - almost four decades since the programme, led by the US, was conceived and nearly a quarter of a century since Britain initially started paying tens of billions of pounds for it. The aircraft are among the most advanced, stealthy and lethal jets on the planet, provided they have the right technology, weapons and - crucially - software updates.

A persistent squeeze on UK defence budgets, though, means military chiefs developed a bad habit of slowing down the F-35 procurement and scrimping on orders to save money in the short term - only for taxpayers to be hit with a much larger bill overall and for the RAF and the navy's Fleet Air Arm to be left with jets that are unable to meet their full potential. The Public Accounts Committee laid bare the impact of this behaviour, highlighting five key issues: One: A short-term cost-saving decision by the MoD in 2021 to save £82m by delaying an investment in what is known as an Air Signature Assessment Facility - which is vital for the F-35's stealth capabilities to fly undetected - will add an extra £16m when it is finally built in 2032.

More worryingly, this limits the UK's ability to deploy the jets. Two: A cost-saving move to delay by six years building infrastructure for the naval squadron that operates the F-35 jets means the cost for that construction will almost treble to £154m from £56m.

Three: A failure by the MoD to accurately update the total acquisition cost of the F-35s. The department only this year said the whole-life cost until 2069 to acquire a total of 138 aircraft will be almost £57bn - up from £18.4bn for the first 48 jets out until 2048.

But even the new higher price tag was dismissed by the MPs as "unrealistic" - because it does not include additional costs such as fuel. Four: The current fleet of F-35B jets will not be armed with conventional missiles to hit targets on the land from a safe distance until the early 2030s.

This is a critical capability in modern warfare when operating against a country like Russia that has sophisticated air defence weapons that can blast jets in range out of the sky. Five: The military will claim its F-35B jump jets have met "full operating capability" by the end of the year - a timeline that is already years late - even though they do not have the long-range missiles and are blighted by other woes.

A 'leaky roof' mistake Sir Geoffrey Clifton-Brown MP, the committee chair, said: "Making short-term cost decisions is famously inadvisable if you're a homeowner with a leaky roof, let alone if one is running a complex fighter jet programme - and yet such decisions have been rife in the management of the F-35." The UK's existing F-35Bs are designed to fly off the Royal Navy's two aircraft carriers. The nuclear weapons-capable A-variant only operate off the land.

The MoD has said it will purchase an additional 15 F-35Bs and 12 of the As at an anticipated cost of £3.2bn. However, there is no estimate yet of the cost to certify the F-35As to join a NATO mission, carrying American nuclear warheads.

Read more:Can UK's new air defence missile systems protect us? The MPs said they were told work on becoming certified to operate with US nuclear weapons "is at an early stage and the department did not provide any indication of forecast costs". 'Very complacent' The report flagged concerns about personnel shortages and how that impacted the availability of the few F-35s the UK does operate.

This included the need for an extra 168 engineers - a 20% increase in the current workforce and a shortfall that "will take several years to resolve.