If you are an existing Sky TV or Talk customer you can get a great deal for Sky Broadband taking into account Quidco £110 Cashback. But hurry the cashback expires soon. Similar deal on TopCashBack
Here is the math for a 12 month contract:
Sky Broadband £0.00 pa
Sky line Rental @ 16.40 = £196.80 pa
Router delivery charge = £6.95
Total £203.75 per annum
Less Quidco Cashback of £110 = £93.75
Which works out at £7.81 per month
Plus Sky will give you a £50 M&S Voucher , which if you factor that in as cash works out at £3.65 per month for unlimited broadband.
Quidco Cashback -->http://www.quidco.com/sky-digital-upgrades-tv-and-broadband/
I have had Sky broadband for 12 months and never had a problem with it but alas I can't renew at this price as it is for non broadband customers only.