After entering email address and password I am now being asked to verify my identity by passcode and choose whether by phone or email!! Is this something else BT have introduced without notice?
I presume that you are referring to " 2 Factor Authentication" that is available with BT.
This was introduced a few years ago and it must be activated by the account holder, not BT so if you are getting this it must have been activated by the account holder.
See link.
I did not change the setting. I was in my emails and then as it now does it closed and when I logged back in I was asked to verify. I have not logged into MYBT for around six months but have now gone in and switched the two step off.
Very strange!!