Hi Sue M,
I am also on the dance course going into sixth form at Tring. As far as I am aware, there is no specific tracksuit, just general warm up attire etc. Also, with regards to the blazer, if your DD is in sixth form, the uniform requirements are a grey pencil skirt, white blouses (short/long sleeve), a black cardigan, grey tights and black court shoes (no higher than 3 and a half inches I think). There is no blazer. Hope this helps and feel free to PM me!