Jus tto note, hosting365 don't provide internet access or broadband. Our [broken link removed] is sitting directly peered at INEX, so connected to all the Irish ISPs - so should be indicative for all INEX peered providers.
You can ring ntl, give your address and ask how may people are you in contention with on your line (as posted above, up to 17:1). Their tech people will have to give this answer not the front line phone agent. The techies arent always available but I did get called back within 30 minutes with the info when I enquired some time ago when i was worried about my line speed and thought it was contention. I dont know whether other ISPs will give this info over the phone but I cant see why not if they had it available.