I have pre-registered 3 lines for Free BT Privacy with Caller Display for 12 months, but they all don't have that option ticked yet, but instead still this one:
BT Privacy at Home with Caller Display
BT Privacy at Home includes Caller Display and the Telephone Preference Service (TPS) to help prevent unwanted sales calls. From 4 January 2014, the price will be £1.75 a month.
However I would not expect it to take effect yet. The invitation to pre-register said it would take effect some time after the deadline (6th Dec as I remember it but no longer accessible) and I would hope it will take place on the 4 Jan, or as close as, so as to shorten as much as poss the chargeable period after the 12 months.
At least we now know that if it hasn't appeared by late 3rd Jan, we can do it ourselves.
1999: Freeserve 48K Dial-Up => 2005: Wanadoo 1 Meg BB => 2007: Orange 2 Meg BB => 2008: Orange 8 Meg LLU => 2010: Orange 16 Meg LLU => 2011: Orange 20 Meg WBC