Oh dear,
Uncle. I can understand your concern.
However, as things currently stand, I would suggest that you continue with your migration from
O2 to your
DR ISP.
Why? I do not think
O2, as a viable company, have much time left in this world . . .
Assuming that
Beatie does end up owning the
DR infrastructure, you may find yourself in a similar situation to customers of
Orange. You would still be a customer of your chosen
DR ISP, they would provide you with support services, etc, just the physical infrastructure would be owned by the
Beatie Group plc and managed by
Beatie Operate. (Which is a new division within the
Evil Empire of Newgate Street, formed to perform the engineering tasks that
Openreach no longer perform. As for the distinction / division between
Openreach and
Operate, we really need
Black Sheep to educate us with an insider's view.)