My HD installation is due this Thursday. When we bought this house, we inherited an old sky dish which is now a) tatty and b) not in the best place on the back wall, either for appearance or proximity to new plasma. Since it seems from this forum that replacement of the dish is up to the Sky bloke who does the install, should I trash the old one before he turns up, just to make sure? Also, will they drill through (a thick) outside wall to get the feed in?