Hi Chloe, I had my op yesterday and the nurse called me a couple of days before and said not to eat for 6 hours before admission time of 12 (I got up for cereal at 5.30 and went back to bed!!) PhD also said can carry on drinking clear still water after this up until 2 hours before admission but no more than 30ml in an hour but it was important to do that to keep alone pressure OK.
Good luck for your op and hope everything goes well xx