Generally not. When I have tried it usually comes up with not available in your region. On our recent trip to the Baltic which was out of reach for our satellite dish I tried using iPlayer and got the out of region message.
Another way is to get a Slingbox.
I got one a couple of years ago because I travel a lot for work. Works well mostly. Some countries are a challenge but they even block UKCS!
Also remember that most shared routers in Hotels/campsites etc etc limit your connection speed so no one person can hog it, so you may find your watching the "buffering" message more than the program itself!!!