The EU and member states: power over some key policy areas

This shows how relative EU and national government responsibilities vary from one policy area to another. Some government departments are much more extensively involved in EU deliberations than others. In areas such as social security, health care and education, the EU does not try to influence the content of national policy, but it insists on equal treatment for all EU citizens. This caused problems

for David Cameron in his efforts to revise the terms of Britain's EU membership, when he tried to restrict EU migrants' access to the UK's welfare benefits system.