Hi @mummy917
It's coming to crunch time now, and I'm sure your apprehension and nervous tension is building.
The key thing here is that he is moving out on Saturday.
You are going to be taking over the rental contract from then.
So you can change the locks, if your LL agrees (I'm sure he will, if you are paying).
Until then, keep doors locked and bolted with key in the lock.
He is no longer welcome in YOUR home.
It is not up to him to decide whether that is or is not reasonable or controlling, in fact, you haven't the remotest interest in his opinion.
I would be guided by your instincts, and by continuing to centre your children's best interests, as you have done all the way through.
I would also pay attention to what a court might think is or is not 'reasonable'.
Tell him, via email or text, that if he cannot have the children for the agreed time this week, he needs to give you notice of that, and explain it to the children.
If he wants to just see them briefly for a couple of hours or so, then he must agree the date and times with you at least 24 hours in advance.
This is to give the children notice of where they will be/what is happening during what is bound to be a difficult first week of the new living arrangements.
That is all what a court would deem 'reasonable'.
You should also explain that any time he spends with them is to be at a place TBA by him, as he is no longer welcome in your home (as per his choice to leave, yours not to have him visit).
Again, this avoids confusion for the children ('daddy left on Saturday but now he's back').
A court would also deem this 'reasonable'.
Let him sort it out.
Good luck, OP, keep going as you have been 💪💐