As long as the UK is still a member of the EU, the rules for UK citizens who visit, live in and work in Norway will remain the same as before. They can use the registration scheme for EU/EEA nationals, and they can apply for permanent right of residence if they have lived here for at least five years.
The possible exit of the UK from the EU may take years. The UK may also negotiate an agreement which may give rights to UK citizens in Norway.
We will give information on udi.no when it has been formally decided if, and what year, the UK will leave the EU, and what agreement the UK possibly reaches which may decide the rights of UK citizens to work and live in Norway.