Consumers can currently receive Sky Broadband free for a whole year, when they sign up to a new contract online.
The deal offers Sky's 17Mbps broadband service and comes with no downloads caps, meaning truly unlimited usage.
The offer also includes a free Sky Hub router, unlimited Sky Wi-Fi at over 20,000 locations, and help from the Sky Switch Squad, which is designed to make changing broadband providers simpler.
Those looking to take advantage of the offer must sign up to a 12-month contract, and also pay £16.40 line rental each month.
For a limited time only, those who do so will receive a £100 M&S voucher, which can be spent online or in store at the high street giant.
Customers looking to add TV to their package can also upgrade to the Original Bundle, which offers 35 premium TV channels, more than 70 Freeview channels, a free Sky+HD box, and Sky Go, all for an extra £14 a month on a 12-month contract.