You do not currently need to apply for a document to prove you can live in the UK unless:
- you’re an extended family member of someone from the European Economic Area (EEA) or Switzerland
- you want to apply for British citizenship
- you want to sponsor your partner’s visa application under the Immigration Rules
There will be no change to the rights and status of EU citizens living in the UK until 2021. You and your family can apply for ‘settled status’ to continue living in the UK after June 2021. The scheme will open fully by March 2019.
If you’re a Croatian national you can now work in the UK without a registration certificate.