Well it sems I have a right to know where my children stay when they are with X, so I'm going to tell her that before B and G stay with her, I need to know the address of where she lives.
I found this out by dropping an email to my solicitor, and she replied within an hour - so nice to get some reassure quickly, rather than having to worry about it.
Incidentally, X hasn't got any beds or furniture yet, but we have agreed that the children with be resident with me (atleast thats the legal term for it), and only stay with X two nights a week.
That will start with X has got her new place setup for B and G.