ballet for a 3 years old. Any suggestions for a good relaxed class in NW3?

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I think my daughter would like to try and start ballet. She is nearly three and being so young I don't want a strict class, just a nice place where she can build up her confidence and familiarise with the idea of ballet, having fun in the meantime.
We live in hampstead. I know there are many dance/ballet schools around here - any suggestions anyone?
My older one is a boy so I just had to deal with capoeira football and rugby classes so far :-)