... also there have been stories of folks being unable to retain their phone numbers when switching away from Primus line rental to WLR (a BT based landline.)If people on WLR move to TT LLU, then AIUI it is normally no problem switching back.
The problem arises if the initial line installation was by an LLU supplier such as TT/Sky/C & W and the number therefore came from their allocated range, not a BT one. (Think mobile phone moves before number transferability became mandatory).
Thanks for the clarification Bob
Primus current T&C's actually seem to mention that a phone number may not be retained, under some circumstances, when joining and not when leaving as I thought they previously stated...as you say there should be no problem if switching from, and to, WLR.