I thought I'd throw this out there for you all to consider. This is what the odds makers are showing on the possibility of a Brexit.
Currently about 43% of the bets are on a vote to "Leave" the European Union, or commonly referred to as a "Brexit". The "Remain" camp is seeing about 57% of the bets in their favor.
This isn't to mean that 57% will vote to remain, simply that 57% of the bets are that the people of Britain will vote to remain in the EU.
The odds as I have listed below too have shown some tightening over the last 24 hours as well. It should be interesting to see how some of the last polls come in.