If your an existing BT customer who is out of contract, or if your contract is up for renewal, and you place/or agree to place your calls through them its possible to get £36 credit off your line rental .
How: Call Freephone 0808 100 2425 and ask to be put through to the customer options team tell them your considering moving your line rental to Primus Line Rental £8.99 a month including inclusive E&W calls.
If you agree to take another 12 month contract, at the moment they will usually offer you a one off credit of £36 off your bill bringing your line rental down to £8.54 a month from £11.54 (Paper Billing/Paid by dd.)
Having just reread this, I thought I should query the figures you gave in your final paragraph BJ.
I believe that Paper Billing + Direct debit is actually £12-79 per month, so a £30 credit wouldn't bring your line rental down to £8-54 as you say.
You only get line rental of £11-54 with
paper free + direct debit I believe, so you would have to adopt that combination, and get the £36 credit, to reduce your costs as you indicated.
Do you agree ?