Ecclestone is making noises that F1 may leave free-to-air TV entirely in the UK, he also says that Sky gets 10m viewers while the BBC only attracts 6 or 7m. Where he gets his figures I don't know...
http://www.guardian.co.uk/sport/2012/jun/07/bernie-ecclestone-formula-one-free-bbc
http://www.guardian.co.uk/sport/2012/jun/07/bernie-ecclestone-formula-one-free-bbc