"However, if Betfair (BET.LN +1.51%) Sportsbook, a bookmaker, is to be believed, there is a 79% likelihood of a ‘no’ vote. It’s so confident of the outcome of Thursday’s referendum that bets for the union placed before 10:00 a.m GMT on Sept. 16 will get a payout, Betfair says."
pretty cool web site, they are constantly updating it