What i meant was that the best value way is to take money out once you are there, a small fee per transaction but you get the banks FX rate, saves you a fair bit unless you are taking out tenners every couple of hours.
Its more convenient as you dont have to go to the post office or wherever, its safer as you dont have to carry all your spending money hundreds of miles with you, and everyone i work with who is foreign do this without thinking about it, whereas for all the natives Going to get the holiday money is the first thing on their to do list before they go away