Siena Castellon: 'Autistic people are really struggling with how uncertain things are'

The 18-year-old autism campaigner and international children's peace prize finalist on why diagnosis of the condition for girls urgently needs improving

Each morning Siena Castellon synchronises her morning routine to music with the same 30-minute playlist. Different songs act as time markers. The trick is to choose music you love and to listen to the same playlist every day," explains the teenager.

When Wonderwall by Oasis comes on she knows she should be brushing her teeth. By the time Summertime Sadness by Lana Del Rey is playing she is walking out the door.