No worries, Sykes! I think the girls have been not bad about it, on the whole. One of them, (the eldest, possibly, or maybe the second one) did go through a stage of blaming my friend for the split and that was hard. She has come round now and they have all accepted the situation as far as I know. The youngest barely noticed that her dad had gone - he wasn't particularly hands-on.
They see their dad regularly, as he's only about 20 miles away. I think he has them one weekend a month and he comes to babysit once a week. To me, he's always been a bit of a sh*t where seeing the children is concerned as he wouldn't think twice about cancelling the arrangement if a better offer came up, which must have been quite hard for them. (He's horribly overweight and drinks a lot, yet seems to have no problem attracting girls - weird.) My friend says it's getting harder to ensure all the girls see him regularly, because the older two prefer to go off with their friends at weekends and so on. I think he takes them on holiday, as well. My friend takes them to see her ex-MIL, as she wants to maintain the grandparent relationship. She herself lost her parents many years ago and thinks it's important to keep that going. Also, her ex-MIL thinks her ex-dh is as big a prat as she does, lol!
As to whether he is happy, I don't really know. If being 40-something but acting an undignified 20-something floats your boat, then I suppose he must be. He and my friend only ever talk practicalities so she only hears things via other people.