* EU only had control over a limited number of areas of policy when the UK was a member
* The EU controlled trade, competition policy and customs and tariffs
* Whilst the EU had some control over immigration, agriculture, fishing, environmental policy, regional development, social and employment policy and parts of foreign and security policy
* In all other areas, however, the UK Parliament was already sovereign when a member of the EU: including most taxation, national defence, education, health and social security.