Windrush scandal (2018)
Retroactive changes to UK immigration rules and documentation requirements left British citizens of Caribbean descent unable to prove their status. Some were detained, lost jobs and were deported.
The government apologized, set up a compensation scheme and overhauled the Home Office's hostile environment policy.
The episode became the standard warning about applying new settlement rules to people already in the country.
The earned settlement rules apply retroactively to workers already in Britain, the same mechanism that produced Windrush.
