Leave for the following reasons:
Must control immigration properly.
It will have zero effect on the economy in the medium to long term.
It will shake the EU up and make them rethink about some of their nonsense which may mean at a later date we can re enter on better terms. Or better still the whole thing collapses and the U.K. having left earlier is better placed to take advantage having forged better links with the rest of the world.
We already do 55% of our trade outside the EU, higher than any other EU country.