Hi im new to this site but wanted to pass on something that I hope will be a little helpful to those with ADHD. Tangles are not a miricle cure but a fiddle toy that I got for my son a few months ago from The Tangle Shop online. He has ADHD and really struggles to concentrate at school, he has his tangle on his desk to fiddle with! its great!! His teacher is really impressed with it and he has also said how other kids in the class want one as they are "cool"! If you havent got one yet i would recommend them for fidgety kids with SEN.
Hope that helps!