Secondly work out if i ordered a second line it would come from the cabinet with fttp?
Information about the exchange/cabinets: SMBF, my cab 49T, other cab 44T.
These sorts of issues used to come up in the early days of ADSL with some people on the boundary between two telephone exchanges - one enabled and one not - wanting to be changed to ADSL enabled one (or have a new line fitted)
As someone has said there are no guarantees and most second lines are installed using the spare cables in existing telephone lines but if you're willing to take a gamble, you could try ordering a new line
on the condition that it should only he installed if it comes from cab 44T in the order notes.
Thats what some tried to do then - order a new line on condition it came from the other exchange.
You would need to find a provider willing to let you order a new line on this basis, confirm (and reconfirm) that such a condition is properly stated in the order notes and that the engineer also knows about it on the day of the install.. - and if they are not going to do that than refuse/cancel the installation on the day..
Regards
Sunil