Just out of interest, what do you actually pay? What does that include?
I'm on the "Talk Anytime" call plan which costs £4.50/month
Plusnet Unlimited Fibre - Market 2/3 charge - £19.99
So for that basic package: £24.49
I then have Caller Display @ £0.99
Last month I made 3hrs 25mins of calls to UK Landlines (£0.00) and my kids made 11mins of calls to mobiles via the landline instead of using their mobiles which added an extra £1.88
I paid the line rental upfront using the Line Rental Saver which as of Nov 2013 cost me £137.88 at £11.49 a month. (I've just checked today and I can actually renew for the next period at that same price of £11.49 which I might do in order to beat any potential price rises given BT have just increased theirs to £16.xx).
So including line rental, I pay a minimum of £36.97 / month.