If you wish to PM me your number I can chase this up with BT to ensure they are dealing with the DACS 
Thanks for that. Apologies for the late response - for some reason I didn't get an email and have only just checked the thread.
I don't think there's any need to chase up BT
yet. Your guys have emailed me to let me know that BT have discovered it is trickier than first thought, but the work is scheduled for the 9th.
I'll report back later in the week!