Here's another vote for PlusNet. We've been with them for over 2 years now, they are very good and if you have a problem you just ring them up, they are in Yorkshire, and get instant help. We have broadband and landline with them, which is cheaper than broadband only and BT for the landline. As they are an independent company within BT, I'm sure you would still be able to use BT1571 as your answerphone.