Carphone Warehouse have purchased OneTel and Tele2 - see
http://news.bbc.co.uk/1/hi/business/4541148.stmWhich means our choice of supplier is gradually being eroded.
Its not a good idea to move your line rental from BT for a number of reasons. One being if you use Caller Display you get it free with BT, and other suppliers charge for it wiping out and more, any savings you would have made. TT can bar access to 1899 etc if they want to BT can't.
The BBC new bulletin says they will bring all products under just Talk Talk brand. Presumably this means JDS as well. As you will see they have also purchased Tele2.
Another point will they now allow access to cable customers as OneTel do at the moment.