British child migrants who were sexually abused at Christian Brothers institutions are planning a silent vigil outside hearings for the Royal Commission into Institutional Responses to Child Sexual Abuse in Perth next week.

Thousands of children were shipped to Australia from Britain from 1947 until 1970, often without the knowledge or consent of their parents.

They were sent to the Bindoon, Castledare, Clontarf and Tardun orphanages in Western Australia, institutions that survivors have described as being more like concentration camps than children's homes.

The ABC reports a fortnight of hearings begin in Perth on Monday.