Since 1945, immigration to the United Kingdom, controlled by British immigration law and to an extent by British nationality law, has been significant, in particular from the former territories of the British Empire and the European Union.
Since the accession of the United Kingdom to the European Communities in the 1970s and the creation of the EU in the early 1990s, immigrants relocated from member states of the European Union, exercising one of the European Union's Four Freedoms. Immigration to and from Central and Eastern Europe has increased since 2004 with the accession to the European Union of eight Central and Eastern European states, since there is free movement of labour within the EU. In 2021, since Brexit came into effect, previous EU citizenship's right to newly move to and reside in the UK on a permanent basis does not apply anymore.