Thanks for all your comments, I really appreciate the input. I'm torn between feeling 'god, I'm too old' and 'fuck it I'll wear what the hell I like' at the moment. I'm not keen on any of the other links, apart from the TK Maxx one, which is beautiful but just too much sparkle for me.
I'm 5'2 and size 12 and although I have quite petite features, I think I might be a bit too dumpy for the dress. I do want floor length as I detest my legs!