srw
It's a bit more complicated than that...
https://www.homeandbusiness.openreach.co.uk/about-usClassic33
OpenReach is not part of BT now. It is a separate company which sub contracts to BT. My next door neighbour who works for OpenReach gave me this info.
A completely separate business.... that is wholly owned by BT. Which means it's still part of BT.