I'm currently paying £20.99 for Plusnet Unlimited Fibre, plus £19.99 line rental. There's an offer on my account to recontract for £26.99 a month, so assuming it is inclusive of line rental, that's a saving of £13.99 a month.
However, clciking the link to view the offer, it's only for the 40/10 connection - I'm currently on 80/20, which is why I haven't renewed (yet).
I'm out of contract, and have been for some time.