UK to France returns treaty extended to October and widened to cover people smuggled back by lorry

The bilateral returns agreement between the United Kingdom and France, the one popularly called "one in, one out", was due to expire on 11 June 2026. It did not. On 12 June 2026 the Foreign, Commonwealth and Development Office presented to Parliament an exchange of letters, Command Paper 1603, Treaty Series No. 25 (2026), recording that the Home Secretary wrote to the French Minister of the Interior on 2 June 2026 proposing an extension and amendments, and that the French reply of 8 June 2026 accepted them. The instrument entered into force on 9 June 2026 and runs the agreement to 1 October 2026.

The underlying treaty is short and unusually explicit about what each side owes the other. Signed at London on 29 July 2025 by Yvette Cooper and at Paris on 30 July 2025 by Bruno Retailleau, published as Command Paper 1377 and in force from 6 August 2025, it obliges France under Article 4 to readmit third country nationals who reached the UK by small boat, provided the UK proves prior presence in France, confirms the person is an adult or an accompanied minor, and confirms there is no outstanding protection claim, human rights claim, suspensive remedy or injunction. Unaccompanied minors are excluded. Requests must normally be made within 14 days of arrival. In exchange, Article 12 commits the UK to run a voluntary application route for people already in France, capped in number, with visas valid for three months, and it lets the UK close that route if the ledger tilts. Article 1(3) says the two flows are "intended to be regularly balanced". Article 17 creates a joint committee meeting monthly, which may seat a European Commission observer, and Article 20 requires monthly reviews whose statistics are shared with the Commission.

What the June 2026 letters add is a definition. A "Returnee Case" is a person previously removed to France under the treaty who has come back to the UK "via clandestine means (other than Small Boat or air)". Such people now fall inside the scope of readmission, and the ordinary 14 day clock is replaced by a 14 day window running from the date the person is encountered. The stated objective of deterring clandestine returns was added to Article 1. Alex Norris, the minister quoted by the Electronic Immigration Network on 17 June 2026, said "a small number of cases have recently emerged involving individuals previously removed under the Treaty who have re-entered the UK through other clandestine routes". Because the change was made under Article 20 and the extension under Article 22, no fresh parliamentary ratification was required.

The official arithmetic was published on 16 July 2026 in the Border Security Commander's annual report data. Between 6 August 2025 and 30 June 2026 the UK returned 1,087 people to France and admitted 1,117 from France. Nothing moved in August 2025. The monthly figures climbed from 17 returns in September 2025 to 264 in June 2026. The Home Office cautions that a person returned more than once is counted only once, which matters now that repeat removals are explicitly contemplated.

The published counts do not sit easily with earlier reporting. InfoMigrants reported on 17 March 2026 that 377 people had been returned and 380 admitted since August 2025, roughly 12 transfers a week and about 2 per cent of the 18,790 small boat arrivals recorded since the treaty took effect. The government's own monthly table for August 2025 to March 2026 totals 463 returns and 443 admissions. The two accounts have not been reconciled in public, and the cut off dates behind them are not stated in the same terms.

Oversight bodies have concentrated on who is being detained to make the transfers happen. On 12 August 2026 Jane Leech, interim national chair of the Independent Monitoring Boards, wrote to Anna Turley, Minister for Border Security and Asylum, saying Home Office officials had reported 304 age disputes between 15 August 2025 and 1 May 2026, of which 94, or 31 per cent, were assessed to be children. The letter records that only 63 of 617 Rule 35 health reports in this cohort led to release between August 2025 and mid April 2026, and that officials described needing "150 coming into detention" each week to absorb attrition and legal challenge. A briefing published in May 2026 by the Jesuit Refugee Service UK and the Humans for Rights Network counted at least 141 age disputed young people detained under the scheme, at least 64 later found to be children or taken into local authority care, and at least 18 removed to France.

What happens on 1 October 2026 is not known. The treaty can be extended again only by mutual written agreement, and the letters do not commit either government beyond that date. Nor is it known how many Returnee Cases have been identified since June, how many of the 1,087 returns involved people later found to be children, or whether the joint committee has recorded the balance of numbers as holding.