I'll have a go...
Cons
Collapse of the pound against the Dollar and Euro
Cost of imports higher
Increased Inflation
More difficult for us to travel to European Countries
The end of the European Health Insurance card
Global financial institutions may move out of London
No more European structural funding
My summer holiday is now going to cost a feckin fortune
Pros
No European influence over our legal system
Collapse of the pound against the Dollar and Euro
Cost of exports more attractive to foreign companies
Reduced European legislation over consumer goods standards eg reducing power output of vacuum cleaners etc
No, sorry failed, couldn't find ten intelligent pros and cons without further research and I suspect my poor effort will end up being far better than 75% of the population.