No, sunseeker none at all! BT tried to tell us all sorts of things, you might not be able to keep the same number etc, but it was no problem at all.
It's amazing as well the sort of deals BT will offer when you say you want to leave, shame they didn't think of that before.
I can honestly say that I would recommend PlusNet to anyone, very reasonable prices, great service and really helpful staff.
We are now paying a total of about £15 a month (sometimes less) for all calls except mobiles and premium rate numbers AND our broadband!