Although I haven’t had anything directly from BT about moving over, probably because I'm not near end of contract yet, there does seem to be some subtle changes going on in the background. Two things in particular are apparent:-
My BT router no longer re-boots every 14 days or so. Probably no issue at all but it could, and did, interrupt a tv stream when it went.
Using Ookla SpeedTest web and/or app, the Provider now shows up as EE not BT. Again not a problem, line speed parameters have not changed.
I'm just in the process of upgrading my BB package so let’s see what ensues.
Regards all