Its always useful to see the end of year shows of the schools to have an idea of what the training looks like and importantly, to see if there are happy dancers on the stage.
I do know that at Tring the lower school dancers perform with English National Ballet each year, both in London and on tour, sometimes twice a year, and that is a wonderful opportunity for the children, they just love that. And, in this last year, 2 Tring graduates joined English National Ballet company making a total of 5 that went straight into that company from school. So with the younger ones performing with ENB and the older ones joining the company, Tring is producing quality dancers.
I do advise Sarahw to audition at all 4 MDS schools, as often there is a 'feeling' you get when you visit a school and your instinct tells you what would be right for your child.