English learning activities for kids (Oslo)

Hello -
Does anyone know about any English classes/ after school programmes in English in the Oslo/Lørenskog area? I know there are classes for Dutch speaking children...

A friend of mine has two kids who are bilingual (Norwegian/English) and she wants them to practice their English in a structured way as they go to Norwegian school.

Are any of you in the same situation? Maybe it could be possible to arrange for an activity group?