National and Regional Parliaments in the European Constitutional Order

How does the Parliament of the United Kingdom hold ministers to account for their European policies? How does the EU principle of subsidiarity affect the relation between Westminster and the Scottish Parliament? How does Belgium accomodate its powerful regional assemblies into the European role of its federal parliament? What is the role of the Dutch parliament before and after the popular rejection of the Constitutional Treaty in the Netherlands? How does the parliament of Croatia view all thes