I did contact them. There reply basically said they don't have any information and keep checking with providers. Doesn't really help
That happened to me. All you can do is keep checking https://www.btwholesale.com/includes/adsl/main.html daily until someone gives up their connection or capacity is increased. Banging on at OR and my BDUK scheme got me absolutely nowhere.
ECI cabs have a max capacity of 256 subscribers I believe.
The cab served 260 lines at the time it was activated in 2013.