Hi, just to clarify, you're asking re mainstream secondaries?
(My eldest is at a fabulous special school, but I am guessing this is not what you want?)
It might also depend on what the dd's diagnosis is - I understand there are some good units at secondary schools for young people with ASD. If the dx is more physical then I guess she'll need accessibility.
Also, is the dd's family keen for her to access a school within Merton, or open to our of borough placements? (Our primary school feeds into schools in Merton and Kingston, as well as a CofE secondary in Wandsworth borough)