French Interior Ministry source says France is discussing with the UK the terms for withdrawing from the “one in, one out” agreement

Bilateral returns arrangements of this kind sit at the intersection of domestic migration politics and cross-Channel relations, and episodes where one side signals withdrawal have historically been used as negotiating leverage rather than as terminal positions; the usual sequence is a public souring of tone, a pause in operational cooperation, and then either renegotiation on altered terms or quiet continuation. The actors matter here: French interior ministry sourcing rather than a ministerial statement tends to indicate an exploratory or pressure-signalling stage, and past France-UK disputes in this space have been shaped as much by the domestic political calendar on both sides as by the operational merits. The transmission channel to markets is limited and indirect, running through political risk premia on French and UK assets and, at the margin, through any read-across to the broader post-Brexit bilateral relationship rather than through trade or freight flows directly. What is worth watching is whether the UK side acknowledges the talks, whether the Elysée or the Prime Minister's office takes ownership of the file, and whether the discussion extends to adjacent cooperation on border enforcement, which has tended to be the tell for whether withdrawal talk is genuine or tactical. Absent confirmation of scope and timeline, the signal is diplomatic rather than economic.