Blimey iLove - sorry to hear what happened with Crapartist, but, like some others, I can understand why she did it in the panic of the moment. Too public - everyone had said how great the changes were, she wasn't quite happy, if she'd said on the thread that she'd changed it again, a lot of people would have jumped on her for wasting your time and effort, I'm sure. So much easier to just delete it all! A bit shocked about the FB Block though, that's poor :(
But for your visiting children, that thread was a triumph! Sorry the dental trip was on your Wedding Anniversary (congratulations, btw!) but sounds like it was a very needed mission!
Just a warning, which I doubt you need, but the Platform 9 3/4 installation at King's Cross is VERY busy. VERY VERY busy! It's on the main concourse, next to the Harry Potter shop (don't go in there, for the love of god, unless you have plans for a second mortgage!) and there is a roped section around it for queuing purposes.
I took the boys there last time we were in the UK, but decided it was too busy (we had a lot else planned) and we were going to the HP Studios near Watford anyway, where they have 3 or 4 more of them set up for photography purposes. Much easier for us! But not for you, of course.
Anyway, good luck with your London trip - hope it all goes smoothly! And well done to you again 