When I left Sky recently, the £2.50 per month "Supplement for not having Sky TV" was not refunded for the "unused days". Further, it appears I am to be billed forever for not having Sky TV, despite me not being subscribed to Sky Broadband & Talk!
Upcoming bills:
http://s3.postimg.org/joe8w4aib/upcoming.png
One to look out for, for people without Sky TV leaving Sky Broadband.
Oliver.