I have had sky installed at numerous houses as a new line. I have always rang not online and always got a specific date which I can choose, they also give morning, afternoon and evening slots. There's normally nothing for around 10 days and after that you are free to pick.
I had the broadband phone line and everything installed and activated at once in all cases. Dunno why other people suggest otherwise... I've always had a slot of around 4 hours given to me. Afterall we need it to fit around us too!!
Edited by ukhardy07 (Tue 22-Oct-13 13:31:33)