200 words marketing paper

The UK has always had an interesting relationship with the EU.  For example, it retained the use of the British pound and never became a part of the Euro zone (Denmark didn't as well, and other limited countries for different reasons).  The UK has scheduled a referendum vote for June 23, 2016 so that the people of the UK can vote to stay in the EU or leave.  What are your thoughts about the pros and cons of this move?