It takes a peculiar cast of mind to find cause for concern when a child says grace before meals. But it is this which prompted the parents of a girl who did just that at home, having learned to do so at school, to challenge the entire system of religious education in Northern Ireland.

They are humanists and object to their child being taught the tenets of Christianity as truths in school.

So they brought a case against the school which ended in the UK Supreme Court. In a unanimous decision the Court found that religious education lessons and collective worship which are not "objective, critical and pluralistic" are a form of "indoctrination".