Reform UK's plan to deploy the Royal Navy to intercept small boats in the English Channel and forcibly return migrants to France or Belgium was met with a wall of scepticism on Monday, as the French government, former military commanders and legal experts branded the scheme unworkable, unlawful and disconnected from the realities of the fleet it relies upon.

Launched at a London press conference and set out in a 28-page policy document, the plan — dubbed "Operation Fortress" — would, in the words of Reform leader Nigel Farage, deliver a Channel in which "within a fortnight, there would be no more boats". Yet almost every actor outside the party moved swiftly to pick the proposal apart, from Paris warning of "a violation of French sovereignty" to a former Royal Navy commander noting that the service has "basically none" of the ships the operation would require.

Under the proposals, ten Royal Navy patrol vessels would deploy military-crewed inflatable boats to "come alongside" migrant dinghies. Border Force officers and police on board would arrest those crossing, before Navy personnel or Royal Marines transported them back to France or Belgium. A Bay Class landing ship would provide what Reform describes as "detention capacity at sea" for up to 700 people — a figure that corresponds to the overload capacity of such a vessel, roughly double its normal complement of 356. The party said it would establish a joint military command drawing on the Royal Navy, Royal Marines, RAF and British Army, alongside a surveillance command to track incoming boats, and would pass emergency legislation "as necessary" to grant any further powers required.

Reform insists the plan is both legal and humanitarian, claiming it carries the backing of former senior military figures and that intercepted migrants would be given water, food and a medical assessment before being escorted back across the Channel. "It will save lives, it will help the French in fulfilling their job of stopping the boats and it will save a huge amount of money," Farage told reporters. "When you think about it, what is the Royal Navy for? If the Royal Navy is not there to protect this country from invasion, then, frankly, I can't see what its purpose is."

The central weakness in the proposal, critics say, lies in a question the party has not convincingly answered: what happens if France refuses to take anyone back. Reform's home affairs spokesman, Zia Yusuf, conceded the party would need agreement to disembark arrested migrants at French ports — but suggested it would proceed regardless. "If the Elysee Palace refuses, make no mistake — His Majesty's Royal Marines will disembark them safely on the very shore they left that morning," he said. That scenario, of British forces landing people on French soil without consent, is precisely the point at which legal experts say the plan collapses.

International maritime law requires coastal states to help anyone in distress at sea and to bring them to a place of safety as quickly as possible, with the only exception being where doing so would endanger the rescuing vessel or its crew. Crucially, while conventions permit states to pick people up from boats in danger, they do not allow those people to be taken to another country without that nation's consent. UK warships, experts note, cannot operate in French territorial waters or disembark intercepted people without French agreement. Even Reform's insistence that it would not conduct "pushbacks" runs into difficulty: attempting to "rescue" migrants who do not wish to be rescued by British vessels raises the same problems of consent and safety.

France left little doubt as to its position. The interior ministry said the plan "would be a violation of French sovereignty as well as a violation of maritime law and international law", while pointedly adding that crossings were already down in 2026 under existing arrangements with the UK. Reform responded that it would "always stand up for British interests and protect our people, whether Emmanuel Macron likes it or not", insisting that "humanitarian missions do not violate maritime or international law".

Military voices were no more encouraging. Tom Sharpe, a former Royal Navy commander, told the AFP news agency the plan was "not really where the solution lies". "There's a lot the Navy can do but the idea of… ferrying people back to France, against the French's will, to me just doesn't add up," he said, before turning to the question of capacity. "When you start looking at what ships we have, which is basically none… he's talking about the largest maritime operation in the Channel since World War Two, a very evocative image, but that's not the reality." Andrew Fox, a former paratrooper now at the Henry Jackson Society, was blunter still, saying the plan "sounds magnificent, provided you know nothing about ships, sailors, France or the law". Jon Featonby, chief policy analyst at the Refugee Council, warned that "the last thing anyone should be proposing is anything that would risk more loss of life, as this plan inevitably would".

The government's rebuttal leaned heavily on precedent. A Downing Street spokesman pointed out that the Royal Navy had already been handed primacy for small boat crossings under the previous Conservative government in 2022 — a period that produced no reduction in numbers. "The Royal Navy is already tackling many threats, including monitoring any Russian warships operating near our shores, protecting our waters and our critical national infrastructure," the spokesman said. No 10 argued that Border Force officers were better suited to lead operations, citing crossings down almost 50% compared with last year and nearly 60% of attempted crossings stopped since Labour took power. Energy Secretary Miatta Fahnbulleh dismissed the Navy proposal as "gimmicky", warning: "You'd spend a lot of time arguing with France, and not enough time actually getting to grips with the problem."

The figures do complicate Reform's framing of a country "being invaded", as Yusuf put it. The provisional total of crossings for 2026 so far stands at 14,526 — 43% lower than by the same point last year and down 14% on 2024. Home Office data show an overall downward trend since crossings peaked in 2022, though a single-day record of 752 arrivals was set on 29 July. Britain and France signed a new three-year deal in April, with London paying Paris up to €766 million in return for boosted enforcement. Between 2018 and 2025, 162 people died in the Channel, according to the University of Oxford's Migration Observatory — the human cost that hangs over every claim, from any quarter, to be acting in the name of safety.

The timing of the launch drew its own scrutiny. A Labour spokesperson accused Reform of having "reheated an old announcement in their latest desperate bid to distract from their growing sleaze scandals", adding: "Anger and easy answers won't bring crossings down." The charge lands as Farage fights a by-election in Clacton, triggered by his own resignation amid allegations he received and failed to declare millions in donations. A parliamentary probe into a £5 million donation received shortly before the 2024 general election is on pause while he sits outside the Commons. Reform has recently lost its national polling lead for the first time in over a year, sitting narrowly ahead of a resurgent Labour, and the major parties have declined to field candidates against Farage — leaving him, by his own telling, in a "people versus the establishment" contest, though in practice largely up against the comedy candidate Count Binface.

For all the martial imagery, the proposal revives an idea with a short and unhappy history. A Navy-return policy was floated and abandoned by the Conservatives in 2020; the Navy was handed control of Channel operations in 2022 only for the Home Office to take responsibility back in January 2023, after a record number of crossings during its eight-month tenure. Whether the fleet exists to deliver "the largest military operation in the English Channel since World War Two", whether France would tolerate it, and whether it could survive contact with maritime law all remain, on Monday's evidence, firmly unresolved.