Sky.com/SkyTalk
This is a great offer exclusive to Sky TV Customers and means that if you take out Sky Broadband Max for 12 months with Sky Line Rental and Sky Talk Freetime, you get unlimited broadband for 3 months, half price line rental for 3 months, and free weekend and evening calls to UK landlines.
This really is a good deal and could save you a lot of money compared to your BT Line Rental, and it will mean that you only get one monthly bill from Sky.