So further update. He texted this morning saying he is moving into the spare room on Friday and we can sort things out in the coming weeks. He is still adamant he wants mediation.
Mediation here is compulsory before you go to court, they hope I guess you an sort things that way instead of clogging up the courts. Neither of us can afford to go the lawyer route anyway (although I have seen one for advice) so I would prefer to avoid it.
I'm not sure what he is hoping to achieve by coming home. There is no blame divorce here. His behaviour doesn't affect anything. We don't have any money or really any property to be divided, if he is hoping for a bigger share. I will have the children most of the time (he works shifts, it will be impossible for him to do a 50/50 custody split.) he will likely only be able to have them 2 weekends every 5 weeks, unless he changes his work. Which i doubt as it is so precious to him.
I know the rules, and I will try to act 'as if' and to just get on with my stuff, but it's going to be do awkward! And the children will be delighted. It's just so odd. And I can't get in to see my IC for another 2 weeks. I'm just feeling so apprehensive already.