All EU citizens (and their families) in the UK, regardless of when they arrived, will, on the UKs exit, need to obtain an immigration status in UK law. They will need to apply to the Home Office for permission to stay, which will be evidenced through a residence document. This will be a legal requirement but there is also an important practical reason for this. The residence document will enable EU citizens (and their families) living in the UK to demonstrate to third parties (such as employers or providers of public services) that they have permission to continue to live and work legally in the UK. Following the UKs exit from the EU, the Government may wish to introduce controls which limit the ability of EU citizens (and their families) who arrive in the UK after exit to live and work here. As such, without a residence document, current residents may find it difficult to access the labour market and services.