Sweden is removing elderly British citizens who lived lawfully in the country for decades because they missed a Brexit residency application deadline of 31 December 2021. The EU-UK Withdrawal Agreement explicitly provides for late applications where "reasonable grounds" exist. Sweden, according to the UK Foreign Office, the campaign group Brits in Sweden, and now a Swedish MP, has accepted none of them. The cases are brutal in their specifics. Joyce Thomas, 78, a retired nurse, moved to Sweden 21 years ago with her husband. He handled all paperwork and checked whether Brexit required action — they were told it did not. He died of cancer in 2023. She applied weeks later. Sweden says ignorance of the deadline is not a reasonable ground. She has four weeks to leave the country where her family, friends, and husband's grave are located. Horace (George) Mason, 74, has dementia and Parkinson's disease and is in full-time care. He moved to Sweden 25 years ago to be near his son Carl and grandchildren. His family argued under the European Convention on Human Rights that he had a right to remain near the family he depends on. The migration court of appeal ruled that "the state's interest in regulated immigration outweighs Mason's interest in continuing to reside" in Sweden. Håkan Svenneling, a left-party opposition MP for Värmland, has written to migration minister Johan Forssell asking what he "intends to do to stop the deportations." Svenneling argues the Withdrawal Agreement was "not intended to result in elderly people who had lived in Sweden for decades losing their rights to remain because of a missed deadline." He frames the deportations as damaging UK-Sweden bilateral relations at a moment when Stockholm is actively trying to strengthen ties with London. David Milstead, who leads the 9,000-member campaign group Brits in Sweden, says the group raised alarms as early as 2020 and that the safeguards were "untested." His assessment is stark: among genuine missed-deadline cases, the group "cannot verify one in which Sweden accepted the reasons for applying late." A zero-acceptance rate on a treaty provision designed for exactly these situations. The UK Foreign Office confirms it has "repeatedly raised concerns with the European Commission" that Sweden is taking a "considerably stricter approach" than any other EU member state, with a disproportionate number of refusals. Milstead identifies the mechanism: Sweden's migration politics have moved sharply toward restriction, and that domestic posture is bleeding into how it implements an international treaty obligation. The migration agency's own position — that not knowing an application was required is not a reasonable ground — effectively nullifies the late-application provision for the population most likely to need it. The structural pattern here is a state using procedural compliance as a tool of removal against people who were lawfully present and self-sufficient. The Withdrawal Agreement's "reasonable grounds" clause exists precisely to prevent this outcome. Sweden's interpretation renders it dead letter. The question is whether the European Commission, which oversees treaty implementation, will tolerate one member state operating an effective zero-acceptance policy on a provision that other states are applying with flexibility.