Thinkbroadband has a report (from about a week ago - I've just seen it in their weekly summary) that Openreach is having a trial in which ISPs can specify their own VDSL modems, or modem/routers.
http://www.thinkbroadband.com/news/5656-trial-to-let-providers-supply-their-own-vdsl-modem-on-the-wa...This could be interesting. Is Plusnet going to participate?
Graham
(ps. Apologies if someone asked the same question a week ago. I checked recent posts but didn't go back all the way.)
