There was a recent thread about this which Zen replied to.
A new telephone line is £118
ADSL activation is £48
FTTC activation is £30
You only need pay either the ADSL or FTTC activation charge, depending on which product you want. I believe these prices all include VAT.
I would be surprised if a new install from BT is only £65, their install charges used to be quite steep, hence the expensive charge passed on from Zen.
Edit: Just spotted the 'online special offer' from BT. Usual price is £130. I would check line rental over 12 months for each and see which one would be cheaper in the long run.
Edited by Geordish (Wed 11-Nov-15 17:23:27)