Autism spectrum disorder (ASD) is a lifelong, neurodevelopmental condition that affects approximately 1% of the population (Baird et al., 2006). It is characterised by core impairments in social reciprocity, social communication and flexibility, as well a constellation of associated difficulties, including problems with executive function, sensory sensitivity, emotional and behavioural regulation, language, motor control and eating (American Psychiatric Association (APA), 2013).