The UK's proposed "one in, one out" migrant deal with France, while seemingly straightforward, faces potential complications. Beyond the basic concept of returning one migrant for each one arriving in the UK, the agreement's implementation is expected to encounter legal challenges, political resistance, and practical obstacles. The specifics of identifying and returning migrants, ensuring compliance with international law, and navigating the political sensitivities on both sides of the Channel will likely prove complex. The long-term viability and effectiveness of the deal remain uncertain.