Debate has grown about the legitimacy of Muslim faith schools within the British education system. At the same time, scepticism has developed towards multiculturalism as a normative approach for dealing with diversity. This article argues that it is worth retaining the normative impetus of multiculturalism by returning to its roots in political philosophy. In particular, we can draw on Will Kymlicka's distinction between "internal restrictions" and "external protections" as a way to assess the legitimacy of minority claims. Having outlined this distinction, the paper applies it to the case of Muslim Schools.