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Yo Baby! (yobaby.co.uk) run music and movement classes at the YMCA at Surbiton Library Hall but it looks as though the classes are up to 3 and a half years old. Worth trying for those with younger toddlers though.
I'm sorry I'm coming to this late. If you haven't already sorted something look at Lucinda Walsh's School of Dance. She's very sweet and fairly new but my children love ballet with her. She does also do Street Dance. Based in Hamilton Ave and Knollmead, Tolworth.