There is one thing to watch out for with Max Premium. There are different makes of equipment used in 20CN exchanges. If you are put on to a Marconi mux it is almost certain that you will experience disconnections nearly every time the phone rings for an incoming call (even if you don't have a phone plugged in). I experienced that on my Plusnet supplied line.
Luckily I contacted A&A under their we'll fix it guarantee who identified the issue when I described what was happening. Plusnet told me first there was no alternative equipment, but after further advice from A&A
Good news is that there are two Fujitsu 20cn mux's on your exchange so if you moved over to us we would request a tie pair change to move your line over.
Andrews & Arnold
which I relayed back to Plusnet, I was moved to the Fujitsu equipment and the problem went away.
Plusnet November 2001 to October 2016
Telephone rental: Pulse8