I had B/T tv with no aerial, mine comes through the internet via the phone/broadband socket on the wall.
Which meant if the internet went down, so did my tv.
How did you watch the main channels like BBC,ITV etc? I'm assuming BBC through Iplayer? ITV through ITV Hub etc etc
No, they stream the channels into the BT vision/youview box. That's how they can deliver Sky sports without a dish.
Yes I'm aware of the premium channels being delivered that way, but on the BT TV website it says an aerial is required for Freeview channels.
BT wouldn't use Sky. However Sky would use BT to install the line as its a physical requirement. Are you sure the order was with BT. If so a dish wouldn't be required as the signal is through the phone line.