Sky 12 month free line rental offer

I was migrated from O2 to Sky last year but I didn't take up the home phone offer at that time so have been paying £9 /m for unlimited Sky broadband (which included a £5 surcharge for not having line rental)

Today in the mail I got an offer from Sky for 12 months free line rental - I had been thinking of moving line rental anyway since OneTel stopped their great Calls auction that gave me half price line rental.

So signing up for free line rental has reduced my broadband bill to £4 so I am quite a happy bunny - a saving of around £240