As the BBC is still received on their digiboxes people phone Sky and they tell them they are working on the problem - when, the fact is, you're perfectly correct they have noting to do with the BBC transmissions.
I'm sure Astra will move the BBC problem channels to another transponder if the problems continue - this should be seamless to the users.
Remember in the old analogue days Sky were transmitting a screen full of channels from Astra as part of the sales drive. Included were Eurosport, Cartoon Network, TCM etc. At that time these channels were FTA and had nothing to do with Sky. A few phone calls and they dissappeared from the promo!
Amazing how many people think all satellite TV is run by Sky. (including Sky employees)