Undocumented Commonwealth citizens resident in the UK – UK Visas and Immigration
‘This information is for Commonwealth citizens (known as “Windrush” cases) who are long-term residents of the UK and do not have documents to demonstrate their status. It explains their position and what they need to do next.’
UK Visas and Immigration, 17th April 2018
Source: www.gov.uk/government/organisations/uk-visas-and-immigration