Hi Spook - Haven't written lately, but have kept up with your situation. I think you're doing really well. What's good is that you're being proactive and you have a plan!
You're taking a control of your life, and that is empowering.......and scary. Well done for having the courage to try. I think it can be soul-destroying to simply sit and wait for your ex to make the next move. It is FAR too easy to feel like (and be) a victim to their whims. I suspect he is feeling guilty beyond belief, and that is why he can't look you in the eye. He's bound to have moments of wondering what in the world he's done, and of feeling terrible at how badly he's hurt all of you.
I've never been divorced, but I would suggest that you think ahead to what would happen if you wanted to move back to England down the line, once you're stronger. As you say, your friends/family are here, and you're moving away. It is an act of self preservation, and a way to protect your children too. But, there may come a time when you're feeling strong (and homesick), and want to come back. I would talk to solicitor about how to keep that option open for yourself in terms of housing/property. You might not want to come back to the same house, or area. But, the last thing you want is to feel trapped in Ibiza with no options to return home because you can't afford it, or have no place to go.
Go luck today, and stay strong. It is so hard, but you're moving forward and rebuilding your life.