Yes, 18 months even if private. That's such a shame the option doesn't exist in Ireland.
I think my preference would also be for the child to be able to contact the egg donor mother but I honestly just can wait 12-18 months. That, of course, makes me feel guilty because I'm putting my needs before the (potential) child. It's just one of the things I'm struggling with along with "perhaps this is all happening for a reason and I'd be a crap mother", "perhaps I'll hate motherhood so shouldn't push it", "perhaps it's just not meant to be for me", "is it fair to use an egg donor egg, I'm just putting my own desire to be pregnant and give birth ahead of everything else" etc etc etc.
It's lovely that you and your husband are so completely on the same page, although so sad that it's come to this. I do struggle with the fact I want this far more than my OH, he's really just going through all this for me.