world I suspect most of the Germans I know would recognise the description of traits you have just given as "typisch Wessie!"
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You obviously have strong feelings about the school system and it's fine to want to collect your thoughts before posting them here. I am very interested however to hear your views, partly because I still have time to brainwash DD before she starts school (in a positive way, of course) and partly because, with two teachers as parents, I heard a lot about the problems of the UK system growing up.
Wrt to that, EnglishWoman, of course the "teachers are lazy f**kers" attitude is common in the UK, but it is hopefully predominantly confined to Daily Mail readers and not the attitude of most (middle-class) parents. I just think for example that when dnephew comes home complaining that his new English teacher is giving the class 3s and 4s when they were getting 1s and 2s last year, his highly educated parents and GPs should be defaulting to "well, obviously the standard expected this year is higher", not "well, obviously the teacher is a bitter, old cow". The latter may turn out to be true, but they should give the teacher the benefit of the doubt first.
Anyway, rant over! Your daughter is beautiful, EnglishWoman, and it certainly looks like you packed an awful lot into two and a half days. Did your DH cope on his own with the boys, or did he have help? 
Antique I'd forgotten about how weirdly your niece was behaving back when you were pg. Has she settled down since then and is she nice to ds? I bet you've made sure never to leave him alone in a room with her, haven't you? 