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UK Immigration Law and Policy Timeline for Lawyers: Key Rule Changes, Fees and Implementation Dates

Practice notes
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Pre-2025 Development

Illegal Migration Act 2023 (IMA 2023)

  • Gained Royal Assent on 20 July 2023, with some parts effective immediately; remaining provisions have been commenced by regulations.
  • Passed under the former Conservative administration. In July 2024, the new Labour government introduced regulations altering the application date of the section 2 duty to remove.
  • Rather than applying retrospectively to anyone arriving on or after 20 July 2023 (the date of Royal Assent), the duty now takes effect from the date on which section 2 commences.
  • This change suspends the Act’s prohibitions on leave to remain and on citizenship for individuals who arrived in the UK after 20 July 2023 and met specified criteria.

Key date(s)

  • 20 July 2023: Royal Assent; staggered commencement through regulations.

Further reading

  • News Analysis: Implications of the Illegal Migration Act for all immigration cases
  • Illegal Migration Act 2023 (Commencement No 1) Regulations 2023, SI 2023/989
  • Nationality, Immigration and Asylum Act 2002 (Amendment of List of Safe States) Regulations 2024, see LNB News 10/11/2023 34 and LNB...
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Web page updated on 22/05/2026

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