Well i have checked it out and its apparently at least 3months, but please dont take my word for it, theres so many rumers, i would definately get to the bottom of it though as you might need to make a trip to sort out a fast passport. good luck.
Hannah there is every chance you will not be allowed to board the plane if your passport has less than 3 months from your return date left on it. Those are the facts and it's up to you if you want to run the risk but I would strongly advise you to do something about it tomorrow.