UK-France Channel Crossings Deal Explained. What the New £661m Agreement Actually Means

On 23 April 2026, the UK and France signed a new three year agreement to reduce illegal Channel crossings. The deal, announced jointly by Home Secretary Shabana Mahmood and French Interior Minister Laurent Nunez, renews and significantly expands the existing Sandhurst Treaty arrangement, which was first signed in 2018 and extended in 2023. It commits the UK to providing up to £661 million in funding over three years, while France pledges to increase the number of personnel deployed on its northern coastline by more than 50 per cent.

The agreement introduces something not seen in previous versions of this deal, a portion of UK funding is now conditional on France demonstrating measurable results. If the new measures do not deliver sufficient reductions in crossing numbers, based on a joint annual assessment, that conditional funding can be redirected or withheld. The government says this makes UK taxpayers' money work harder. Critics argue it still leaves most of the structural questions about Channel crossings unanswered.

What Was Actually Announced?

The Sandhurst Treaty is the formal name for the arrangement under which the UK pays France to police its northern coastline and prevent migrants from crossing to Britain. It has existed since 2018 and has been periodically renewed and expanded. The new deal, signed on 23 April 2026, is the most significant expansion of that arrangement to date.

The Money

The UK will provide a total of up to £661 million over three years. This breaks down into two distinct pots:

• £500 million guaranteed: This is the core funding commitment that renews and expands the existing arrangement. It pays for French police, intelligence officers, maritime prefecture staff, and supporting infrastructure. This represents an increase of approximately £40 million on the previous cycle's equivalent funding.
• £161 million conditional: This portion is new. It will only be paid if the measures funded by the core package deliver sufficient results, measured through a joint annual evaluation. If results are not adequate, the UK and France will jointly agree to redirect the money to different or additional actions. The government says this is the first time UK funding has included a results based element of this kind.

The Personnel

France has committed to significantly increasing the number of people deployed to prevent crossings in northern France. Under the previous arrangement, approximately 907 personnel were deployed. Under the new deal, that number rises to 1,392 by 2029, a 53 per cent increase. This includes:

• Renewal and reinforcement of the existing 907 strong force of police officers, intelligence agents, and maritime prefecture staff.
• A new specialist unit - the SIPAF (Interministerial Border Police) comprising 80 dedicated personnel focused specifically on illegal immigration at the border.
• Expansion of the GAO intelligence unit from 18 to 30 officers. This is the unit responsible for arrests of smuggling network members. It led to 480 smuggler arrests in 2025.

The Infrastructure

The deal also funds completion of two significant infrastructure projects in northern France:

• An administrative detention centre in Dunkirk - for holding individuals identified for deportation from France.
• A CRS (Compagnies Républicaines de Sécurité) cantonment in Calais - permanent accommodation for police units deployed to the area, intended to improve operational efficiency.

The Technology

The new partnership includes investment in surveillance technology, specifically drones, helicopters, and electronic detection systems. A stated priority is reducing the use of water taxis, smaller, faster vessels that smuggling networks have increasingly used to evade detection as a means of crossing.

The Wider Context

Both governments also committed to working beyond France's northern coast. The agreement includes a stated desire to tackle irregular migration at its source, through joint action in origin and transit countries. France and the UK also agreed to push for stronger European Union involvement, noting that the Channel represents an external EU border. The EU's border agency Frontex has already committed to a presence, with both countries seeking to expand that role.

What Does This Deal Address And What Does It Not?

The government has presented this agreement as a meaningful step forward. Critics, however, have raised a number of concerns about whether more officers and more money will resolve what they see as deeper structural problems. The following section sets out both the government's position and where specific criticisms have been directed, based solely on what the deal itself contains.

Performance Linked Funding: A Genuine Accountability Mechanism?

The inclusion of £161 million in results dependent funding is the most structurally novel element of this deal. The government argues this is a direct response to longstanding criticism that UK money has been paid to France without sufficient accountability for outcomes.

Smuggling Networks, Can More Officers Keep Pace?

A consistent concern raised about the existing Sandhurst arrangement is that smuggling networks have shown a capacity to adapt to enforcement pressure, shifting routes, changing vessel types, and adjusting departure points in response to policing. The new deal focuses heavily on adding personnel and technology to prevent departures from established northern French beaches. Whether this addresses the adaptability of criminal networks is a legitimate question the deal does not directly answer.

• Water taxis are singled out: The new deal specifically mentions reducing water taxi crossings, acknowledging this has become a more significant route. This is a direct response to a tactic smugglers have already adopted.
• GAO expansion is modest: The intelligence unit being expanded from 18 to 30 people is relatively small in absolute terms, though it led to 480 arrests in 2025. Whether doubling its size will proportionally increase disruption of networks is unknown.
• Upstream action mentioned but limited: The deal commits to joint action in countries of origin and transit, but this is stated as an aspiration rather than a funded programme with measurable targets.
• 41,472 people reached the UK in 2025: Despite the existing joint operations, this was the second highest annual figure on record since large scale crossings were first detected in 2018, according to official UK figures.

The Question of Arrests and Prosecutions

The government highlights 480 smuggler arrests in 2025 as evidence that the intelligence dimension of this deal is working. However, arrests are not the same as convictions, and neither is necessarily the same as a lasting reduction in network capacity. The deal does not include published data on prosecution rates, sentencing outcomes, or evidence that arrested individuals have not been replaced within the networks they operated in.

• The GAO unit expansion is positive: Moving from 18 to 30 officers represents a meaningful increase in dedicated investigative capacity.
• Arrests as a metric have limits: If arrested individuals are quickly replaced within organised networks as is common in serious organised crime, the headline arrest figure may not reflect lasting disruption.
• No prosecution or conviction data has been published as part of this announcement. The stated metric is arrests.

Limited UK Oversight of Operations on French Soil

A recurrent criticism of previous Sandhurst arrangements has been that the UK funds French operations but has limited visibility of how those operations are conducted day to day. The new deal does not appear to change this fundamentally. UK funding supports French commanded forces operating under French law on French territory.

• Joint evaluation is the main accountability mechanism: The annual review gives the UK a formal role in assessing outcomes, but does not provide ongoing operational oversight.
• France retains command: All personnel deployed under this agreement operate as part of French police and intelligence structures. The UK has no direct operational control.
• No independent auditor has been confirmed: The joint evaluation process is bilateral, UK and France rather than involving a neutral third party. This limits the degree to which performance claims can be independently verified.

Transparency and Public Accountability

The announcement sets out the headline figures, officer numbers, funding amounts, and stated results but a number of details that would allow fuller public scrutiny have not been published alongside the deal.

• The performance thresholds for conditional funding are not public. Without knowing what specific outcomes must be achieved to unlock the £161 million, it is not possible for Parliament or the public to assess independently whether conditions have been met.
• The methodology for the joint annual evaluation has not been published. It is not known how crossing numbers will be counted, which baseline will be used, or how attribution (whether a fall is due to this deal or other factors) will be established.
• The full treaty text has not been published as of the announcement date. The GOV.UK press release and French Interior Ministry roadmap are the primary public documents available.

Enforcement Without Reducing Demand

Critics of enforcement focused Channel crossing policies across a range of organisations have consistently argued that coastal policing alone cannot resolve irregular migration if the underlying conditions that cause people to attempt the crossing remain unchanged. This criticism applies to this deal as it has to previous iterations.

• The deal does not include safe legal routes: There is no provision within this agreement for expanding legal pathways for asylum seekers or refugees to reach the UK, which some argue would reduce the incentive to use dangerous crossings.
• Asylum processing timelines are not addressed: Long waiting times within the UK asylum system are sometimes cited as creating backlogs that add to public concern. This deal does not touch that dimension.
• Push factors in origin countries: The commitment to upstream action in countries of origin is noted but is not backed by a separately funded programme within this announcement.
• The 2025 data illustrates the challenge: 41,472 people crossed in 2025 the second highest year on record despite the existing joint operations that this deal renews and expands.

The Political Context

This deal lands at a politically sensitive moment for the UK government. Prime Minister Keir Starmer faces pressure from the right of British politics on immigration, with Reform UK and parts of the Conservative Party framing Channel crossings as a test of government credibility. May 2026 local elections are approaching, and immigration remains one of the most prominent issues in polling of voter concerns.

The government has repeatedly emphasised the scale of its immigration enforcement activity since taking office pointing to the 60,000 removals and deportations, record illegal working enforcement, and the closure of asylum seeker hotels in favour of accommodation centres. This deal fits within that broader framing of tougher, results focused migration management.

It is also notable that Frontex, the EU's border and coastguard agency, has committed to a presence in the area. Both governments have expressed a desire to strengthen European involvement in monitoring what they describe as an external EU border despite the UK's departure from the EU. This reflects the practical reality that Channel crossings are not solely a bilateral UK-France issue, but one that involves origin and transit countries across Europe and beyond.

Conclusion, A Bigger Deal, But the Same Fundamental Approach

The UK-France agreement signed on 23 April 2026 is the most significant expansion of the Sandhurst Treaty framework since it was created in 2018. It commits substantially more money, substantially more French personnel, and introduces for the first time a results linked element intended to make UK funding conditional on measurable outcomes. The government presents it as a historic step forward that builds on demonstrable joint success in preventing tens of thousands of crossings and arresting hundreds of smugglers.

At the same time, the core approach remains the same as it has been under every version of this agreement, fund France to increase enforcement on its northern coastline and prevent boats from departing. That approach has not yet produced a sustained reduction in annual crossing numbers, which reached their second highest recorded level in 2025. The new deal expands the scale of the same model, and the performance linked funding adds a layer of accountability that did not previously exist though the precise terms of that accountability have not been made public.

Whether this deal marks a genuine turning point will depend on whether the new measures translate into sustained reductions in crossings, and whether the conditional funding mechanism proves to be a genuine lever or a political signal. The annual reviews built into the agreement provide a formal mechanism for assessing this and a point at which the public and Parliament will be able to scrutinise whether the commitments made in April 2026 have been kept.