What's the difference between a British residence card and permanent residency?

The difference between a residence card and a permanent residence card is that the residence card has strict entry and exit supervision. You have to live for half a year, while the permanent residence status is enough to enter the country once every two years.

The benefits of these two categories are almost the same. The whole family enjoys free medical care and education during the residence card. The main difference between residence card and permanent residence lies in social welfare and political rights.