Yes, as a BT Wholesale "owned" line, but you don't need to go to BT Retail for your line rental. You could use other providers like Post Office, or, maybe, your new BB ISP (e.g. O2/Be) might also do it.
1999: Freeserve 48K Dial-Up => 2005: Wanadoo 1 Meg BB => 2007: Orange 2 Meg BB => 2008: Orange 8 Meg LLU BB => 2010: Orange 16 Meg LLU BB