Currently paying £5 per month for their basic package, I got the previous 6months free after I cancelled last year, I’m about to cancel again and no doubt I’ll get yet another free period along with a vastly reduced price for the remaining time, I say this with a degree of confidence as I’ve been doing this for the past 2 years!
I’ve been reliably informed that they’ll offer almost anything to keep you as a customer- especially if you actually go through with a cancellation- as subscriber numbers has a direct coronation with their advertising revenue.
The trick (for me at least!) has been cancel, let the box becomes effectively a freeview terminal - you still get free channels via Sky even after cancellation- ignore the letters offering increasing discounts - you get around 4 - then play hard ball when their telesales Phone practically begging you to come back!