It's very much about educating through play rather than play for play's sake which is why some parents don't like it.
If they play with sand they don't just build a castle they practice making the shape of letters in the sand or count blocks in the sand or something.
They have exercise books and they are taught to hold a pen and they are taught how to write the alpabet. Many nurseries I visited, other than Montessori, don't do this at all.
They have one on one reading practice as well as the usual story time.
They use computers as one of the play activites.
They must always put the toy they have finished with away after (this is fab, can't believe it when lottie does it at home!)
if they play in the home corner for example the salt and pepper pot is a real one not pink barbie ones.
It's very structured as well.
i think that's all tight and is certainly what i have observed.
They also have outside tachers that come in, so on a Monday they are joined by Mmme Francais and on Tuesdays cartwheels come in ad do a kind of gym class, on Wednesdays they have the music teacher come in and so on.
Some of the teachers speak in French to the kids nearly all the time. lottie knows how to count in french a bit, a song all about 'sur le tete' and all the woirds of Frère Jacques and is greated with a bonjour etc.