You have all my empathy - I was in a similar situation with ex not moving out and it was one of the most difficult times of my life.
Just a thought here - why not cancel Sky in your house and have it put in your parents house instead?
You need to sit down with your parents and explain that you do not want to gang up on H, but he is making you completely miserable and it is bad for the grandchildren.
the one bit of advice I really am glad I stuck to and still do - it is really hard - bite your tongue when you want to say something nasty about your H in front of the kids. Say anything you like on MN or to friends, but not in front of kids... trust me on this one!
so the Sky thing??
good luck with solicitors - mine cost me so much it makes your eyes water. the thing I learnt was this, no matter how high flying your lawyers are, you still need to do the thinking yourself. Keep doing the thinking and question them on every move, for them it is just a process.
I wish I'd had Mumsnet when I was going through it all, you have been given goldmines of advice! Good luck! - and if you have a heart to laugh, just imagine him with his mates, "What went wrong?" "Oh, she got a PC and it ended our relationship"......yeah, he'll look so sexy to future prospects and friends saying things like that! Idiot. But you are not an idiot. Have courage and wishing you all the best x