The BT Wholesale one will be saying the line "currently supports", not "available".
Assuming you are right about the cabinet, it could be simply BT Broadband sales/marketing rollout policy, or even all the currently available connections on the cabinet have now been taken up. I forget how many in the FTTC cab I saw being wired to the old cabinet, but it might have been 36 or 48 out of the maximum possible of 288.
So March may be when the cabinet gets additional connectivity.
(Edit - see this post
My broadband basic info/help site - www.robertos.me.uk
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Edited by RobertoS (Sat 29-Jan-11 13:36:10)